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Top of the pagePublications-2013
 
Investigation of optical limiting properties of Aluminium nanoparticles prepared by pulsed laser ablation in different carrier media, Rajamudili Kuladeep, L. Jyothi, P. Prakash, S. Mayank Shekhar, M. Durga Prasad and D. Narayana Rao, Journal of Applied Physics 114, 243101 (2013).
 
Fabrication and Photostability of Rhodamine-6G Gold Nanoparticle Doped Polymer Optical Fiber, Suneetha Sebastian, Ajina C, C. P. G Vallabhan, V. P. N. Nampoori, P. Radhakrishnan, M. Kailasnath, CHIN. PHYS. LETT. Vol. 30, No. 11 (2013) 118101.
 
Study of regulation of anthocyanin production from confederate rose by spectroscopic method and their non linear optical characterization, Ani Augustine Jose,Pranam Prakash,Aparna Thankappan,Sheenu Thomas,V.P.N.Nampoori, I.J.S.N., VOL. 4(2) 2013, pp.294-298.
 
Microring lasing from a dye-doped polymer-coated silica fiber, Jaison Peter, C P G Vallabhan, P. Radhakrishnan, V P N Nampoori and M Kailasnath, Laser Physics 23 (2013).
 
A study on tuning of the face orientation of ZnO nano/micro crystals by a wet chemical method, Aparna Thankappan, Sheenu Thomas, V.P.N. Nampoori chineses optics letters [in press].
 
Dynamics of tightly focused femtosecond laser pulses in water, S Sreeja, Ch Leela, V Rakesh Kumar, Suman Bagchi, T Shuvan Prashant, P Radhakrishnan, Surya P Tewari, S Venugopal Rao and P Prem Kiran Laser Physics 23, (2013).
 
Laser emission from the whispering gallery modes of a graded index fiber, C.L. Linslal, S. Mathew, P. Radhakrishnan, V.P.N. Nampoori, C.P. Girijavallabhan, M. Kailasnath, Optics Letters 38(17) 2013.
 
Concentration tuned bandgap and corresponding nonlinear refractive index dispersion in Ga-Ge-Se nanocolloids, Indu Sebastian, S. Mathew, V. P. N. Nampoori, P. Radhakrishnan, and Sheenu Thomas, Journal of Applied Physics 114, 053102 (2013).
 
Impact of Intermediate localized states on nonlinear absorption of Ga-Ge-Se nanocolloidal solution, Indu Sebastian, S. Divya, V.P.N. Nampoori, P. Radhakrishnan, Sheenu Thomas, Applied Physics Letters 102, 031115, (2013).
 
Studies of nonlinear optical properties of PicoGreen dye using Z-scan technique, C. Pradeep, S. Mathew, B. Nithyaja, P. Radhakrishnan and V. P. N. Nampoori, Applied Physics A, (2013), (In press).
 
Effect of marine derived deoxyribonucleic acid on nonlinear optical properties of PicoGreen dye, C. Pradeep, S. Mathew, B. Nithyaja, P. Radhakrishnan and V. P. N. Nampoori, Applied Physics B, 111(4), pp. 611-615, (2013).
 
Solvent effect on the third order optical nonlinearity and optical limiting ability of betanin natural dye extracted from red beet root, Aparna Thankappan, Sheenu Thomas, V.P.N. Nampoori, Optical Materials (In press).
 
Two photon fluorescence spectra from MEH-PPV/Polystyrene based film waveguides, G. Sreelekha, G Vidya ,M S Ebin, K Geetha ,S Sreeja, Rani Joseph, S Pratapan,P Radhakrishnan, C P G Vallabhan and V P N Nampoori, Journal of Optics, 42(2), pp. 101-105, (2013).
 
Measurement of thermal diffusivity of MEH–PPV in different organic solvents using laser induced thermal lens technique, G. Sreelekha, G. Vidya, P. Radhakrishnan, C.P.G. Vallabhan, V.P.N. Nampoori, Optik - International Journal for Light and Electron Optics, 124(17), pp. 3138-3141, (2013).
 
Thermal diffusivity of nanofluids composed of rod-shaped silver nanoparticles, Misha Hari, Santhi Ani Joseph, S Mathew, B Nithyaja, V. P. N. Nampoori, P. Radhakrishnan, International Journal of Thermal Sciences, 64, pp. 188-194, (2013).
 
Optical spectroscopy and visible fluorescence of TeO2- ZnO glasses, Rose Leena Thomas, P.R. Rejimole, V.P.N. Nampoori, P. Radhakrishnan and Sheenu Thomas, Optics and Photonics Journal (In Press).
 
Detection of adulteration in virgin olive oil using a fiber optic long period grating based sensor, T.M. Libish, M.C. Bobby, J. Linesh, S. Mathew, C. Pradeep, V.P.N. Nampoori, P. Biswas, S. Bandyopadhyay, K. Dasgupta and P. Radhakrishnan, Laser Physics, 23(4), pp. 045112-045116, (2013).
 
The effect of annealing and temperature on transmission spectra of long period gratings written in hydrogen loaded standard single mode fiber, T.M. Libish, M.C. Bobby, J. Linesh, S. Mathew, P. Biswas, S. Bandyopadhyay, K. Dasgupta, P. Radhakrishnan, Optik - International Journal for Light and Electron Optics (In Press).
 
A Biosensor for the Detection and Estimation of Cholesterol Levels based on Long Period Gratings, C. Bobby Mathews, T. M. Libish, J. Linesh, P. Biswas, S. Bandyopadhyay, K. Dasgupta, P. Radhakrishnan, Sensors & Transducers Journal, 149(2), pp. 83-88, (2013).
 
Optical characterization of ZnO nanoplates embedded in polymeric matrices for optical limiting applications, Aparna Thankappan, Divya S, Sheenu Thomas, V. P. N. Nampoori, Optics & Laser Technology, 52, pp. 37-42, (2013).
 
Erratum to Synthesis of monocrystalline zinc oxide microrods by wet chemical method for light confinement applications, Aparna Thankappan, Misha Hari, S. Mathew, Santhi Ani Joseph, Rolf Erni, Debajeet Bora, Artur Braun, V. P. N. Nampoori, Physica E: Low-dimensional Systems and Nanostructures, 47 [Note(s): p. 46], (2013).
 
Top of the pagePublications-2012
Effect of Cu and Fe on the electrical properties of Ni-Mn-Co-O NTC thermistor compositions, M. N. Muralidharan, P. R. Rohini, E. K. Sunny, K. R. Dayas and A. Seema, Ceramics International, 38(8), pp.6481-6486, (2012).
 
UV-Visible Photoluminescence of TiO2 Nanoparticles Prepared by Hydrothermal Method, S. Mathew, Amit kumar Prasad, Thomas Benoy, P. P. Rakesh, Misha Hari, T. M Libish, P. Radhakrishnan, V. P. N. Nampoori, C. P. G. Vallabhan, Journal of Fluorescence, 22(6), pp. 1563-1569, (2012).
 
Nonlinear optical characterization and measurement of optical limiting threshold of CdSe quantum dots prepared by a microemulsion technique, S. Mathew, Amit D. Saran, Santhi Ani Joseph, Bishwajeet Singh Bhardwaj, Deep Punj, P. Radhakrishnan, V. P. N. Nampoori, C. P. G. Vallabhan, Jayesh R. Bellare, Journal of Materials Science: Materials in Electronics, 23(3), pp. 739-745, (2012).
 
Size dependent optical properties of the CdSe-CdS core-shell quantum dots in the strong confinement regime, S. Mathew, Amit D. Saran, Bishwajeet Singh Bhardwaj, Santhi Ani Joseph, P. Radhakrishnan, V. P. N. Nampoori, C. P. G. Vallabhan, and Jayesh R. Bellare, Journal of Applied Physics 111(7), 074312, (2012).
 
Studies on CdS nanoparticles prepared in DNA and bovine serum albumin based biotemplates, B. Nithyaja, K. Vishnu, S. Mathew, P. Radhakrishnan, and V. P. N. Nampoori, Journal of Applied Physics, 112(6), 064704, 2012.
 
Saturable and reverse saturable absorption in aqueous silver nanoparticles at off-resonant wavelength, Misha Hari, S. Mathew, B. Nithyaja, Santhi Ani Joseph, V.P.N. Nampoori, P. Radhakrishnan, Optical and Quantum Electronics, 43, pp. 49-58, (2012).
 
Band-gap tuning and nonlinear optical characterization of Ag:TiO2 nanocomposites, Misha Hari, Santhi Ani Joseph, S. Mathew, P. Radhakrishnan, and V. P. N. Nampoori, Journal of Applied Physics 112(7), 074307, 2012.
 
Synthesis of silver nanoparticles in DNA template and its influence on nonlinear optical properties, B. Nithyaja, H. Misha, and V.P.N. Nampoori, Nanoscience and Nanotechnology, 2(4), pp. 99-103, 2012.
 
Evaluation of absolute fluorescence quantum yield of MEH-PPV using laser induced thermal lens technique, G.Sreelekha, G. Vidya, Rani Joseph ,S. Prathapan , P. Radhakrishnan, C.P.G. Vallabhan and V.P.N. Nampoori, Asian J. Spectrosc, pp. 271-275, Special Issue-2012.
 
Refractive index and temperature dependent displacements of resonant peaks of long period grating inscribed in hydrogen loaded SMF-28 fiber, T. M. Libish, M. C. Bobby, J. Linesh, S. Mathew, C. Pradeep, V. P. N. Nampoori, P. Radhakrishnan, Optoelectronics Letters, 8(2), pp.101-104, (2012).
 
Experimental analysis on the response of long period grating to refractive indices higher and lower than that of fiber cladding, T.M. Libish, M.C. Bobby, J. Linesh, V.P.N. Nampoori, P. Radhakrishnan, Microwave and Optical Technology Letters, 54(10), pp. 2356–2360, (2012).
 
Nonlinear optical studies of DNA doped Rhodamine 6G PVA films using picosecond pulses, S. Sreeja, B. Nityaja, Debasis Swain, V.P.N. Nampoori, P. Radhakrishnan, S. Venugopal Rao, Optics and Photonics Journal, 2(3), 135-139, (2012).
 
Effect of lens tilt on SCE and filamentation characteristics of fs pulses in air, S. Sreeja, T. Shuvan Prashant, P. Radhakrishnan, Surya P. Tewari, S. Venugopal Rao, P. Prem Kiran, SPIE Vol. 8434 (SPIE, Bellingham, WA) 84340T, (2012).
 
Filamentation characteristics of focused fs pulses in atmosphere, S. Sreeja, V. Rakesh Kumar, Ch. Leela, P. Radhakrishnan, Surya P. Tewari, S. Venugopal Rao, P. Prem Kiran, SPIE Vol. 8434 (SPIE, Bellingham, WA), 84340U, (2012).
 
Supercontinuum emission from water using fs pulses in the external tight focusing limit, S. Sreeja, S. Venugopal Rao, P. Radhakrishnan, Surya P. Tewari, P. Prem Kiran, SPIE, 8247, 824718, (2012).
 
Synthesis of monocrystalline zinc oxide mircorods by wet chemical method for light confinement applications, Aparna Thankappan, Misha Hari, S. Mathew, Santhi Ani Joseph, Erni Rolf, Debajeet Bora, Artur Braun, V.P.N. Nampoori, Physica E: Low-dimensional Systems and Nanostructures, 44(10), pp. 2118–2123, (2012).
 
Effect of betanin natural dyeextracted from red beetroot on the nonlinear optical properties of ZnO nanoplates embedded in polymeric matrices, Aparna Thankappan, Sheenu Thomas, V. P. N. Nampoori, Journal of Applied Physics 112, 123104, (2012).
 
Top of the pagePublications-2011
Thermal diffusivity of rhodamine 6G incorporated in silver nanofluid measured using mode-matched thermal lens technique , Santhi Ani Joseph, Misha Hari, S. Mathew, Gaurav Sharma, Soumya, V.M. Hadiya, P. Radhakrishnan, V.P.N. Nampoori, Optic. Comms; 283, 313–317 (2010).
Photothermal characterization of nanogold under conditions of resonance excitation and energy transfer, Santhi Ani Joseph, S. Mathew, Gaurav Sharma, Misha Hari, P. Radhakrishnan, V.P.N. Nampoori, Plasmonics (2010) DOI: 10.1007/s11468-009-9116-0
Laser induced Bessel beams can realize fast all-optical switch in gold nanosol prepared by pulsed laser ablation, Santhi Ani Joseph, Gaurav Sharma, Misha Hari, S. Mathew, P. Radhakrishnan, V. P .N. Nampoori, JOSA B ( 2010)
Photoinduced changes in optical properties of Ga–Sb–Ge–Se glasses, R.Tintu , V.P.N. Nampoori, P. Radhakrishnan, Sheenu Thomas ; Optics Communications 284 (2011) 222–225.
Nonlinear optical studies on nanocolloidal Ga–Sb–Ge–Se chalcogenide Glass, R.Tintu, V. P. N. Nampoori, P. Radhakrishnan, and Sheenu Thomas; Journal of Applied Physics 108, 073525 (2010).
Preparation and optical characterization of novel Ge–Se–Sb/PVA composite films for optical limiting application, R. Tintu , V.P.N. Nampoori, P. Radhakrishnan, Sheenu Thomas ; J. Phys. D: Appl. Phys. 44 (2011) 025101.
Ge28Se60Sb12 /PVA composite films for photonic applications, R Tintu, K Sulakshna ,K Saurav, V P N Nampoori, P Radhakrishnan and Sheenu Thomas ; Journal of Non-Oxide Glasses Vol. 2, No 4( 2010) p. 167- 174
Effect of deoxyribonucleic acid on nonlinear optical properties of Rhodamine 6G- polyvinyl alcohol solu-tion, B. Nithyaja, H. Misha, P. Radhakrishnan, and V. P. N. Nampoori; Journal of Applied Physics 109, 023110 (2011)
Nonlinear Optical Characterization of erbium doped Ge- Sb- Se thin films, R. Tintu , V.P.N. Nampoori, P. Radhakrishnan, Sheenu Thomas; Discourse - Science (In press)
Students Chapter in Universities: Their Role in the School Level Technology Enabled Science Education., Praveen Cheriyan Ashok, V.P.N Nampoori; Educational Quest, Vol. No. 1.1,(33-37)(2010)
The Effect of Grating Period on Refractive Index Sensitivity of Long Period Gratings Written in Hydrogen Loaded SMF-28 Fiber, T. M. Libish, M. C. Bobby, J. Linesh, P. Biswas, S. Bandyopadhyay, K. Dasgupta, P. Radhakrishnan, Journal Of Optoelectronics and advanced Materials, Vol. 13, Issue 5, May 2011, pp. 491-496.
Optical Non-linearity in ZnO Doped TeO2 Glasses, Rose Leena Thomas, Vasuja, Misha Hari, V. P.N. Nampoori, P. Radhakrishnan, Sheenu Thomas, Journal Of Optoelectronics and advanced Materials, Vol. 13, Issue 5, May 2011, pp. 523-527.
Shifting of Fluorescence Peak in CdS Nanoparticles by Excitation Wavelength Change, Mathew S, Ani Joseph S, Radhakrishnan P, Nampoori V P, Vallabhan C P, J Fluoresc. 2011 Jan 19.
Periodically Tapered LPFG for Ethanol Concentration Detection in Ethanol-Gasoline Blend, J. Linesh, T. M. Libish, M. C. Bobby, P. Radhakrishnan and V. P. N. Nampoori, Sensors & Transducers Journal, Vol. 125, Issue 2, February 2011, pp. 205-212.
Detection and Analysis of Paraffin oil Adulteration in Coconut oil Using Fiber Optic Long Period Grating Sensor, T.M. Libish, J. Linesh, M.C.Bobby, P.Biswas, S. Bandyopadhyay, K.Dasgupta, P.Radhakrishnan, Optik-International Journal for Light and Electron Optics, doi:10.1016/j.ijleo.2010.12.009.
Fiber Bragg Grating Sensor for Detection of Nitrate Concentration in Water, A. S. Lalasangi, J. F. Akki, K.G. Manohar, T. Srinivas, P. Radhakrishnan, Sanjay Kher, N. S. Mehla and U. S. Raikar, Sensors & Transducers Journal, Vol. 125, Issue 2, February 2011, pp. 187-193.
Nanocomposite thin films of Ga5Sb10Ge25Se60 chalcogenide glass for optical limiting applications , R. Tintu , V.P.N. Nampoori , P. Radhakrishnan, Sheenu Thomas ,Optical Materials 33 (2011) pp.1221–1225.
Top of the pagePublications-2010
Spectral and Nonlinear optical Characteristics of ZnO Nanocomposites, Litty irimpan, V. P .N. Nampoori and P. Radhakrishnan,Science Of Advaced Materials,Vol.2, 117-137,2010.
Matagels thin film based magnetostictive transducers for use in long period grating sensors, Sony Thomas,Jinesh Mathew, Anantharaman,V. P .N. Nampoori, P. Radhakrishnan, Sensors and Actuaters-A,2010 (In press).
Fiber Optic Long Period Grating Based Sensor for Coconut Oil Adulteration Detection, T.M.Libish , J.Linesh, P. Biswas, S. Bandyopadhyay, K. Dasgupta and P. Radhakrishnan,Sensors & Transducers Journal, Vol. 114, Issue 3, March 2010, pp. 102-111
LIQUID LEVEL SENSOR USING ETCHED SILICA FIBER, J. Linesh, K. Sudeesh, P. Radhakrishnan,and V. P. N. Nampoori, Microwave Opt. Technol. Lett., 52, 883,2010.
Thermal diffusivity of rhodamine 6G incorporated in silver nanofluid measured using mode-matched thermal lens technique, Santhi Ani Joseph, Misha Hari, S. Mathew, Gaurav Sharma, Soumya, V.M. Hadiya, P. Radhakrishnan, V.P.N. Nampoori, Optic. Comms; 283(2010) 313?317.
Laser induced Bessel beams can realize fast all-optical switch in gold nanosol prepared by pulsed laser ablation, Santhi Ani Joseph, Gaurav Sharma, Misha Hari, S. Mathew, P. Radhakrishnan, V. P .N. Nampoori, JOSA B (in press 2010) 313?317.
Photothermal characterization of nanogold under conditions of resonance excitation and energy transfer, Santhi Ani Joseph, S. Mathew, Gaurav Sharma, Misha Hari, P. Radhakrishnan, V.P.N. Nampoori, Plasmonics (2010) DOI: 10.1007/s11468-009-9116-0 313?317.
Top of the pagePublications-2009
Fast imaging of laser blow off plume: lateral confinement in ambient environment, Sony George, Ajai Kumar, R.K.Singh, V.P.N.Nampoori, APPLIED PHYSICS LETTERS 94, 141501 (2009).
Effect of ambient gas on the expansion dynamics of plasma plume formed by laser blow off of thin film, Sony George, Ajai Kumar, R.K.Singh, V.P.N.Nampoori, Applied Physics A, 1432-0630 (2009).
Thermal characterization of methylene blue intercalatedmontmorillonites by photoacoustic technique, Lyjo K. Joseph, H. Suja, G. Sanjay, S. Sugunan, V.P.N. Nampoori , P. Radhakrishnana,Applied Clay Science 42 (2009) 483?487.
Thermal characterisation of dye-intercalated K-10 montmorillonite ceramics using photoacoustic technique, L. K. Joseph ; G. Sanjay ; H. Suja ; S. Sugunan ; V. P. N. Nampoori ; P. Radhakrishnan, Philosophical Magazine Vol. 89, No. 10, 1 April 2009, 895?905.
Kinetics of bacterial colony growth by laser induced fluorescence, B. Nithyaja, V. K. Jisha,R. Tintu, A.V. Saramma and V. P. N. Nampoori, Laser Physics, 2009, Vol. 19, No. 3, pp.468-472.
Selective mode excitation in the dye ?doped DNA polyvinyl alcohol thin film, Nithyaja Balan, Misha Hari, Vadakkedathu Parameswaran Narayana Namppori, Appl. Opt. 48 3521-3525(2009).
Hopf bifurcation in parallel polarized Nd:YAG laser, M.R. Parvathi, Bindu M. Krishna, S. Rajesh, M.P. John and V.M. Nandakumaran, Chaos, Solitons & Fractals Vol.42, Issue 1, 2009, pp. 515-521
Effect of a fluctuating parameter mismatch and the associated time-scales on coupled Rossler oscillators, Manu P. John , P. U. Jijo and V. M. Nandakumaran, Pramana, Vol.72, No.3, 2009, pp.495-503.
Identification of spectral lines of elements using artificial neural networks, , M. Saritha, and V.P.N. Nampoori, Microchemical Journal, Vol.91, Issue 2, 2009, pp. 170-175.
Top of the pagePublications-2008

Visible luminescence mechanism in nano ZnO under weak confinement regime, Litty Irimpan, V P N Nampoori and P Radhakrishnan, Journal of Applied Physics, Volume 104, December 2008, Page 113112

Enhanced luminescence and nonlinear optical properties of nanocomposites of ZnO-Cu, Litty Irimpan, V P N Nampoori and P Radhakrishnan, Journal of Materials Research, Volume 23, Issue 11, Novemeber 2008, pp 2836-2845

Nonlinear optical characteristics of nanocomposites of ZnO-TiO2-SiO2, Litty Irimpan, Bindu Krishnan, V P N Nampoori and P Radhakrishnan, Optical Materials, Volume 31, Issue 2, October-December 2008, Pages 361-365  

Kinetic studies of chemical reaction using laser induced thermal lens technique, Achamma Kurian, C V Bindhu and V P N Nampoori, Journal of Optics, 2008, Vol. 37, No. 2, Page 43-50

Fluorescence characterization and gain studies on a dye-doped graded index polymer optical-fiber preform, M Kailasnath, T S Sreejaya, Rajesh Kumar, C P G  Vallabhan, V P N  Nampoori and P Radhakrishnan, Optics & Laser Technology, Volume 40, Issue 5, July 2008, Pages 687-691

Excitatiopn wavelength dependence of energy transfer in dye mixture doped polymer optical fibre preforms, M.Kailasnath, Nishant Kumar, V.P.N.Nampoori,C.P.G. Vallabhan, P.RadhakrishnanJournal of photochemistry and Photobiology A: Chemistry 199(2008) 236-241

Synchronization and control of chaos in coupled chaoitic multimode Nd:YAG lasers, M.R. Parvathi , Bindu M. Krishna, S. Rajesh, M.P. John and V.M. Nandakumaran,  Physics Letters A   Volume 373, Issue 1, 22 December 2008, Pages 96-101

Thermal characterization of methylene blue intercalated montmorillonites by photoacoustic technique, Lyjo K Joseph, H Suja, G Sanjay, S Sugunan, V P N Nampoori and P Radhakrishnan, doi:10.1016/j.clay.2008.06.006

Comparative Performance of Two Fiber Optic Ammonia Sensors Employing Different Sensing Materials, Jinesh Mathew, V. V. Mahesh and P. Radhakrishnan, Sensors & Transducers Journal, Vol. 95, Issue 8, August 2008, pp. 65-71

Linear and nonlinear optical characteristics of ZnO-SiO2 nanocomposites, Litty Irimpan, Bindu Krishnan, V P N Nampoori and P Radhakrishnan, Applied Optics, Volume 47, Issue 24, August 2008, pp 4345-4351

Effect of annealing on the spectral and nonlinear optical characteristics of thin films of nano ZnO, Litty Irimpan, D Ambika, V Kumar, V P N Nampoori and P Radhakrishnan, Journal of Applied Physics, Volume 104, Issue 3, August 2008, pp 033118

Luminescence tuning and enhanced nonlinear optical properties of nanocomposites of ZnO-TiO2, Litty Irimpan, Bindu Krishnan, V P N Nampoori and P Radhakrishnan, Journal of Colloid and interface Science, Volume 324, Issues 1-2, August 2008, pp 99-104

Backscattering of laser light from colloidal silica, Litty Irimpan, V J Dann, Bindu Krishnan, A Deepthy, V P N Nampoori and P Radhakrishnan, Laser Physics, Volume 18, Issue 7, July 2008, pp 882-885

Synthesis and nonlinear optical studies of  nano ZnO colloids, Bindu Krishnan, Litty Irimpan, V. P. N. Nampoori and V. Kumar, Physica E, Volume 40, Issue 8, June 2008, pp 2787-2790

Side illumination fluorescence emission characteristics from a dye doped polymer optical fiber under two photon excitation, M Sheeba, M Rajesh, S Mathew, VPN Nampoori, CPG Vallabhan and P Radhakrishnan, Appl. Opt, 2008 – OSA

Photoluminescence studies on rare earth titanates prepared by self propagating high temperature synthesis method, Lyjo K Joseph, K R Dayas, Bindu Krishnan, Soniya Damodar, K Krishnankutty, V P N Nampoori and P Radhakrishnan, Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, DOI information: 10.1016/j.saa.2008.03.030.

Raman spectra of polymethyl methacrylate optical fibers excited by a 532 nm diode pumped solid state laser, K J Thomas, M Sheeba, VPN Nampoori, CPG Vallabhan and P Radhakrishnan, Journal of Optics A: Pure and Applied Optics, Vol 10, 2008 pp 055303.

Fabrication and characterization of dye mixture doped polymer optical fiber as a broad wavelength optical amplifier, M. Sheeba, M. Rajesh, V. P. N. Nampoori, and P. Radhakrishnan, Applied Optics, Vol. 47, Issue 11, 2008, pp. 1907-1912.

Nonlinear optical characteristics of self-assembled films of ZnO, Litty Irimpan, A. Deepthy, Bindu Krishnan, V.P.N. Nampoori and P. Radhakrishnan, Applied Physics B: Lasers and Optics Volume 90, Numbers 3-4 / March, 2008 pp547-556

Spectral and nonlinear optical characteristics of nanocomposites of ZnO–CdS, Litty Irimpan, V.P.N. Nampoori and P. Radhakrishnan, J. Appl. Phys. 103, 094914 (2008); DOI:10.1063/1.2919109.

Spectral and nonlinear optical characteristics of nanocomposites of ZnO–Ag, Litty Irimpan, V.P.N. Nampoori and P. Radhakrishnan, Chemical Physics Letters Vol 445, 10 april 2008 ,pp 265-269.

Effect of self assembly on the nonlinear optical characteristics of ZnO thin films, Litty Irimpan, A. Deepthy, Bindu Krishnan, L.M. Kukreja, V.P.N. Nampoori and P. Radhakrishnan , Optics Communications Vol 281 , 15 may 2008, pages 2938- 2943.

An Optoelectronic Sensor Configuration for the Determination of Age Related Indices Using Blood Volume Pulse, Jayasree V.K, Shaija P.J, Manu P. John, P. Radhakrishnan, Sensors & Transducers, vol.87, Jan.2008, pp 39-45.

Size dependent enhancement of nonlinear optical properties in nano colloids of ZnO, Litty Irimpan, Bindu Krishnan, A. Deepthy, V.P.N Nampoori and P. Radhakrishnan, Journal of applied physics, 103, 033105 (2008).

Top of the pagePublications-2007

Study of solvent effect in laser emission from Coumarin 540 dye solution, Ritty J. Nedumpara, Thomas K. J., Jayasree V. K., C.P. Girijavallabhan, V.P.N. Nampoori, P. Radhakrishnan, Applied Optics 2007

Multimode laser emission from dye doped polymer optical fiber, M. Sheeba, K.J. Thomas, M. Rajesh, V.P.N. Nampoori, C.P.G. Vallabhan, P.Radhakrishnan, Applied Optics, Vol 46, 8089- 8094, 2007.

Thermal lens technique to study the effect of pH on electronic energy transfer in organic dye mixtures, Achamma Kurian, Sajan D. George, C.V. Bindhu, V.P.N. Nampoori and C.P.G. Vallabhan, Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 67, Issues 3-4, July 2007, Pages 678-682.

Fabrication and Characterization of Monolithically Fused Wavelength-Independent 1X4 Couplers, Samuel Varghese, Muhammed Iqbal, Suresh Nair, V.P.N. Nampoori and C.P.G. Vallabhan, Fiber and Integrated Optics 26, 245-254 (2007).

A Comparative Study of Fiber Optic Humidity Sensors Based on Chitosan and Agarose, Jinesh Mathew, K. J. Thomas, V. P. N. Nampoori and P. Radhakrishnan, Sensors & Transducers Journal, Vol.84, Issue 10, October 2007, pp. 1633-1640.

A comparative study of energy transfer in dye mixtures in monomer and polymer matrices under pulsed laser excitation, M Kailasnath, P R John, P Radhakrishnan V P N Nampoori and C P G Vallabhan, Journal of Photochemistry and Photobiology A:Chemistry, (2007).

Photoacoustic studies on thermal parameters of liquid crystal mixtures, Sajan D George, A K George, P Radhakrishnan, V P N Nampoori and C P G Vallabhan, Smart Mater Struct. 16, 1298-1301 (2007).

Photoacoustic Thermal Characterisation of Porous Rare-Earth Phosphate Ceramics, Sajan D George, Rajesh Komban, K G K Warrier, P Radhakrishnan, V P N Nampoori and C P G Vallabhan, International Journal of Thermophysics, Vol. 28, No. 1 (2007).

Size dependent fluorescence spectroscopy of nanocolloids of ZnO, Litty Irimpan, A Deepthy, Bindu Krishnan, V P N Nampoori and P Radhakrishnan, J.Appl. Phys. 102, 063524 (2007).

Excitation wavelength dependent fluorescence behaviour of nano colloids of ZnO, Litty Irimpan, Bindu Krishnan, A Deepthy, V P N Nampoori and P Radhakrishnan, J. Phys. D: Appl. Phys. 40(18) 5670-5674(2007).

Spectoscopic Characterisation of Laser Induced Plasma from Titanium Dioxide. V J Dann , Manoj V Mathew, V P N Nampoori , C P G Vallabhan, V M Nandakumaran, P Radhakrishnan, Plasma Science and Technology, Vol 9, No 4, August 2007.

Fabrication and characterization of dye doped optical fiber as a light amplifier, Mandanparambil Rajesh, Mavila Sheeba, Karinjamanna Geetha, Chakkalakkal P. G. Vallabhan, Padmanabhan Radhakrishnan, and Vadakkedathu P. N. Nampoori, Applied Optics, Vol. 46, No.1, 1 January 2007.

Thermal characterization of ceramic tapes using photo acoustic effect, Annieta Philip K , Lyjo K. Joseph , Litty M. Irimpan, Bindu Krishnan , P. Radhakrishnan , V. P. N. Nampoori , Raghu Natarajan, physica status solidi (a), (2007).

Laser induced fluorescence based optical fiber probe for analyzing bacteria, P. M. Sandeep, S W B Rajeev, M Sheeba, S G Bhat and V P N Nampoori, Laser Physics Letters, 1-5 (2007).

Light amplification in dye doped polymer films, Ritty J.Nedumpara, Geetha K, Dann V. J, V P N Nampoori,  C.P.G.Vallabhan and P Radhakrishnan, J. of Opt.A:Pure and Appl.Opt.9 (2007) 7-14

Top of the pagePublications-2006

Spectral dependence of third order nonlinear optical susceptibility of zinc phthalocyanine, A Santhi, Vinu V Namboodiri, P Radhakrishnan and V P N Nampoori, Journal of Applied Physics, 100, 053109 (2006).

Simultaneous determination of nonlinear optical and thermo-optic parameters of liquid samples, A Santhi, V N Vinu, P Radhakrishnan and V P N Nampoori, Applied Physics Letters, 89, 1 (2006).

Laser emission from transversely pumped dye-doped free standing polymer film, K Geetha, M Rajesh, V P N Nampoori, C P G Vallabhan and P Radhakrishnan, Journal of  optics A: Pure and Applied optics, 8, (2006) 189-193.

Propagation characteristics and wavelength tuning of amplified spontaneous emission from dye-doped polymer, K Geetha, M Rajesh, V P N Nampoori, C P G Vallabhan and P Radhakrishnan, Applied Optics, Vol.45, No.4, 1 Feb 2006.

Control of bistability in a directly modulated semiconductor laser using delayed optoelectronic feedback, S Rajesh, V M Nandakumaran, Elsevier Physica D 213 (2006) 113-120.

A fiber optic smart sensor for studying the setting characteristics of various grades of cement, M Rajesh, K Geetha, M Sheeba, P Radhakrishnan , C P G Vallabhan and V P N Nampoori, Optics and Lasers in Engineering, Volume 44, Issue 5, May 2006, Pages 486-493.

Characterization of  Rhodamine 6G doped polymer optical fiber by side illumination fluorescence, M Rajesh, K Geetha, M Sheeba, , C P G Vallabhan, P Radhakrishnan and V P N Nampoori, Optical Engineering, 45(7) 075003, July 2006.

Design and fabrication of dye-doped polymer optical fiber for optical amplification, M Rajesh, M Sheeba, K Geetha, C P G  Vallabhan, P Radhakrishnan and V P N Nampoori, SPIE Proceedings: Symposium on Optics & Photonics, August 2006, San Diego, California USA.

Backscattering from nano-sized ZnO suspensions , Bindu Krishnan, A. Deepthy Litty Irimpan, Dann.V.J, V.P.N Nampoori, Physica E 35 (2006) 23-26.

Top of the pagePublications-2005

Dual beam thermal lens and z scan studies of the thermo optical Properties of some non linear materials, A. Santhi, Vinu V N, M R P Kurup, J Kesavayya, P Radhakrishnan and V P N Nampoori, Proceedings of SPIE, Vol. 5710 , (2005),  91-98

Line narrowing effects and enhanced back scattering from ZnO colloids, Bindu Krishnan and V P N Nampoori, J. Material Science, (in press).

Optothermal depth profiling by neural network infrared radiometry Signal recognition, Jyotsna Ravi, Yuekai Lu, and Stéphane Longuemart, Stefano Paoloni, Helge Pfeiffer, Jan Tho and Christ Glorieuxa, Journal of Applied Physics 97, 014701 (2005).

Photoacoustic study on the photostability of polymethyl methacrylate films doped with Rodhamine 6G – Rhodamine B dye mixture system, Annieta Philip, Lyjo K Joseph, Litty Mathew Irimpan, P Radhakrishnan and V P N Nampoori ,Journal of physics: D Applied Physics, 38, (2005), 2904.

Spectroscopic characterization of laser induced tin plasma, S S Harilal, Beau O’ shey, Mark. S. Tillack and Manoj V Mathew, Journal of applied physics, 98, 013306, (2005).

Study on the determination of molecular distance in organic dye mixtures using dual beam thermal lens, Achamma Kurian, Sajan D George, V P N Nampoori, C P G Vallabhan, Spectrochimica Acta part A, 61, (2005), 2799.   

Screen printed nanosized ZnO thick film, Bindu Krishnan and V.P.N Nampoori, Bulletin of Material Science, (in press).
Top of the pagePublications-2004

Complexity Quantification of Dense Array EEG using Sample Entropy Analysis, Pravitha Ramanand V P N Nampoori and R Sreenivasan, Journal of Integrative Neuroscience, 3(3), (2004) 343-358.

Effect of silver nano particles on the fluorescence quantum yield of Rhodamine 6G determined using dual beam thermal lens method, A Santhi, M Umadevi, V Ramakrishnan, P Radhakrishnan and V P N Nampoori, Spectrochimica Acta Part A: Molecular and Bimolecular Spectroscopy, 60 (5), (2004), 1077-1083.

Loss characterization in Rhodamine 6G doped polymer film waveguide by side illumination fluorescence, K Geetha, M Rajesh, V P N Nampoori, C P G Vallabhan and P Radhakrishnan, J. Opt. A: Pure Appl. Opt. 6, (2004),379–383

Photoacoustic Investigation on the photostability of Coumarin 540-doped PMMA, Ritty J Nedumpara, Binoy Paul, Santhi A, P Radhakrishnan, V P N Nampoori, Spectrochimica Acta Part A-60, (2004) ,435-439.

Nanosecond optical limiting response of sandwich-type neodymium dyphthalocyanine in a co-polymer host, B Aneeshkumar, Pramod Gopinath, Jayan Thomas, C P G Vallabhan, V P N Nampoori and P Radhakrishnan, Synthetic Metals, 143, (2004), 197.

Photoacoustic investigations on intrinsic and extrinsic InP, Sajan D George, B Aneeshkumar, P Radhakrishnan, V P N Nampoori and C P G Vallabhan, Optical Engineering, 43 (12), (2004), 3114.

Photoacoustic investigations on intrinsic and extrinsic Si,  Sajan D George, B Aneeshkumar, P Radhakrishnan, V P N Nampoori and C P G Vallabhan, Optical Engineering (2004),   ( in press).

Photoacoustic spectrum of samarium phthalocyanine powder, Nibu A George, R Jyotsna, S Thomas Lee, B Aneeshkumar, J Thomas, V P N Nampoori and P Radhakrishnan, Optical Materials (in press).

Thermal lens technique to evaluate the fluorescence quantum yield of Schiff base, A Santhi, U L Kala, R J Nedumpara, A Kurian, M R P Kurup, P Radhakrishnan and V P N Nampoori, Applied Physics B, (2004) 1-5.

Top of the pagePublications-2003
Photothermal deflection measurement on heat transport in GaAs epitaxial layers.  Sajan D George, P Radhakrishnan, V P N Nampoori and C P G Vallabhan , Physical Review B (2003), 68 (16), 165319
Photothermal deflection studies on heat transport in intrinsic and extrinisic InP.  Sajan D George, P Radhakrishnan, V P N Nampoori and C P G Vallabhan Applied Physics B: Lasers and Optics (2003), 77, 633-637
Effect of Te doping on the thermal diffusivity of Bi2Se3 crystals – A study using open cell photoacoustic technique.  Sajan D George, Saji Augustine, Elizabeth Mathai, P Radhakrishnan, V P N Nampoori and C P G Vallabhan,  Physica Status Solidi (a), (2003), 196(2), 384-389.
A photoacoustic study of the effect of doping concentration in the transport properties of GaAs epitaxial layers Sajan D George, Dilna S, Prasanth R, P Radhakrishnan, C P G Vallabhan and V P N Nampoori,  Optical Engineering, (2003) 42 (5), 1476-1480
Thermal characterisation of intrinsic and extrinsic InP.  Sajan D George, P Radhakrishnan, V P N Nampoori and C P G Vallabhan,  Journal of Physics D:Applied Physics, (2003), 36 (8),  990-993.
Photoacoustic measurement of transport properties in doped GaAs epitaxial layers. Sajan D George, Dilna S, P Radhakrishnan, C P G Vallabhan and V P N Nampoori, Physica Status Solidi (A), (2003), 195 No-2, 416-421 Abstract   Full text
Trace Detection of Nitrites in water using Long Periodic Grating in Multimode Optical Fibers.   P Suresh Kumar, R Dinesh Kumar,  Thomas Lee S, V P N Nampoori and P Radhakrishnan,  Optics Communications ( In Press)
Long Period Gratings in Multimode Fibers: Application in Chemical Sensing.  S Thomas Lee, P Suresh Kumar, R Dinesh Kumar, V P N Nampoori, C P G Vallabhan and P Radhakrishnan,  Optics Communications ( In Press)
Evanescent wave fibre optic sensors for trace analysis of Fe3+ in water.  S. Thomas Lee, P. Suresh Kumar, K. P. Unnikrishnan, V. P. N. Nampoori, C. P. G. Vallabhan, S. Sugunan and P. Radhakrishnan,  Measurement Science and
Technology (2003), 14, 858-861
Abstract   Full text
Effect of silver nano particles on the fluorescence quantum yield of Rhodamine 6G determined using Dual beam thermal lens method Santhi A, M. Umadevi, V. Ramakrishnan, P. Radhakrishnan and V. P. N. Nampoori,  Spectrochimica Acta part B ( In Press)
Optical-limiting response of rare-earth metallo-phthalocyanine doped copolymer matrix.  B. Aneeshkumar, Pramod Gopinath, Jayan Thomas, C. P. G. Vallabhan, V. P. N. Nampoori, and P. Radhakrishnan,  Journal of Optical Society of America B (2003), 20, 1486-1490
Thermal lens spectrum of organic dyes using optical parametric oscillator  Achamma kurian, K. P. Unnikrishnan, D. Sajan George, Pramod Gopinath, V.P.N
Nampoori and C. P. G. Vallabhan,  Spectrochimica Acta part A (2003), 59, 487-491  Abstract  
Full text

Top of the pagePublications-2002

Studies on two photon absorption of aniline using thermal lens effect. Achamma Kurian, K P Unnikrishnan, Thomas Lee Sajan D George,V P N Nampoori and C P G Vallabhan, Journal of Nonlinear Optical Physics & Materials ( In Press)
Studies on fluorescence efficiency and photodegeneration of rhodamine 6G doped PMMA using thermal lens technique. Achamma Kurian, Nibu A George, Binoy Paul, V P N Nampoori and C P G Vallabhan, Laser Chemistry (2002), 20 (2-4), 99-110 
Realization of optical logic gates using thermal lens technique. Achamma Kurian, Nibu A George, S. Thomas Lee, K P Unnikrishnan, V P N Nampoori and C P G Vallabhan, Laser Chemistry (2002), 20 (2-4), 81-87
Design and development of an LED based fiber optic evanescent wave sensor for simultaneous detection of chromium and nitrite traces in water. P. Suresh Kumar, S. Thomas Lee, C.P.G.Vallabhan, V.P.N. Nampoori and P. Radhakrishnan, Optics Communications (2002), 214 (1-6), 25-30
Compact polrization-independent Match-Zender space switch combining carrier depletion and the quantum confined stark effect. R.Prasanth, J.E.M.Haverkort, J.H.Wolter, IEEE Journel of Quantum Electronics ( In Press)
Optical properties of porphyrins in borate glassy matrix.   Kumar, G. A.; Thomas, Vinoy; Jose, Gin; Unnikrishnan, N. V.; Nampoori, V. P. N. , Materials Chemistry and Physics (2002), 73(2-3), 206-211. Abstract   Full text
Effect of pH on quantum yield of fluorescein using thermal lens technique. Achamma Kurian, Nibu A George, Sajan D George, K P Unnikrishnan, Binoy Paul, Pramod Gopinath, V P N Nampoori and C P G Vallabhan, Journal of Optics, (2002), 31(1), 29-36. 
Optical emission diagnostics of laser produced carbon plasma.  Harilal, S. S., Advances in Laser and Optics Research, (2002), 1, 187-230, (Chapter in the book by Nova Publishers)
Photoacoustic Investigation of doped InP using open cell configuration.  Sajan.D. George. C.P.G.Vallabhan, M.Heck, P.Radhakrishnan and V.P.N.Nampoori, Nondestructive Evaluation and Testing,(2002), 18, 75-82. Abstract
Photothermal deflection studies on GaAs epitaxial layers.  George N A, Vallabhan C P G, Nampoori V P N and Radhakrishnan P, Applied Optics, ( 2002), 41(24), 5179-5184. Abstract   Full text
Degenerate four wave mixing in sume metal phthalocyanines and naphthalocyanines. K. P. Unnikrishnan, Jayan Thomas, V. P. N. Nampoori and C. P. G. Vallabhan, Chem. Phys., 279, 2002, 209-213. Abstract   Full text
A Fiber optic evanescent wave sensor used for the detection of trace nitrites in water.  P Sureshkumar, C P G Vallabhan, V P N Nampoori, V N Sivasankara Pillai and P Radhakrishnan, Journal of Optics A.  Abstract   Full text 
Microbent Optical Fibers as Evanescent Wave Sensors .  S Thomas Lee, K. Geetha, V P N Nampoori, C P G Vallabhan and P Radhakrishnan  Optical Engg., ( In Press) 
A microbent fiber optic pH sensor.  S. Thomas Lee, B. Aneeshkumar, P. Radhakrishnan, C. P. G. Vallabhan and V. P. N. Nampoori,   Optics Communications. Abstract   Full text
Chaotic encryption using long wavelength directly modulated semiconductor lasers.  V. Bindu, V M Nandakumaran.,   J. Optics A- Pure & Appl. Optics. Abstract   Full text
NIR to UV absorption spectra and the optical constants of phthalocyanines in glassy medium.  G. A. Kumar, Gin Jose, Vinoy Thomas, N. V. Unnikrishnan and V. P. N. Nampoori,  Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, ( In Press) 
Third order nonlinear optical studies in europium naphthalocyanine using degenerate four wave mixing and Z-scan.   K. P. Unnikrishnan, Jayan Thomas, V. P. N. Nampoori and C. P. G. Vallabhan,  Optics Communications, 204, (2002), 385-390. Abstract   Full text
Photoacoustic studies on n-type InP. Nibu A. George, C. P. G. Vallabhan, V. P. N. Nampoori, and P. Radhakrishnan, Optical Engineering ,(2002) ,41(1), 251-254      Abstract   Full text
Optical properties of porphyrins in borate glassy matrix.   Kumar, G. A.; Thomas, Vinoy; Jose, Gin; Unnikrishnan, N. V.; Nampoori, V. P. N., Materials Chemistry and Physics (2002), 73(2-3), 206-211.  Abstract   Full text
Dynamical aspects of coupled Rossler systems: effects of noise.   Pravitha, R.; Indic, P.; Nampoori, V. P. N. Physics Letters A (2002), 294(1), 37-46. Abstract   Full text
 
Top of the pagePublications-2001
Laser induced photoacoustic technique for the detection of phase transitions in liquid crystals.   George, Nibu A.; Vallabhan, C. P. G.; Nampoori, V. P. N.; George, A. K.; Radhakrishnan, P. ,Nondestructive Testing and Evaluation (2001), 17(6), 315-324.  
Study of energy transfer in organic dye pairs using thermal lens technique.   Achamma Kurian, K P Unnikrishnan, Pramod Gopinath, V P N Nampoori and C P G Vallabhan, Journal of Nonlinear Optical Physics & Materials, Vol. 10, No. 4(2001) 415-421     Abstract   Full text
Effect of time scales on the unfolding of neural attractors.  Pravitha, R; Indic, P; Nampoori, V P; Pratap, R,  The International Journal of Neuroscience, Volume 111, Issue 3-4, (2001),175-186 .  Abstract   
Chemical sensing with microbent optical fiber.  Thomas, Lee S.; George, Nibu Sureshkumar, P.; Radhakrishnan, P.; Vallabhan, C. P. G.; Nampoori, V. P. N.  Opt. Lett.  (2001),  26(20),  1541-1543.  Abstract   Full text
A sensitive fibre optic pH sensor using multiple sol-gel coatings.  Lee, S. Thomas; Gin, Jose; Nampoori, V. P. N.; Vallabhan, C. P. G.; Unnikrishnan, N. V.; Radhakrishnan, P. , J. Opt. A: Pure Appl. Opt.  (2001),  3(5),  355-359.  Abstract   Full text
Use of an open photoacoustic cell for the thermal characterisation of liquid crystals.     George, N. A.; Vallabhan, C. P. G.; Nampoori, V. P. N.; George, A. K.; Radhakrishnan, P.   ,  Appl. Phys. B: Lasers Opt.  (2001),  73(2),  145-149             Abstract   Full text
Open-cell photoacoustic investigation of the thermal effusivity of liquid crystals.  George, Nibu A.; Vallabhan, C. P. G.; Nampoori, V. P. N.; George, A. K.; Radhakrishnan, P. , Opt. Eng.   (2001),  40(7),  1343-1347. Abstract   Full text
Low-crosstalk penalty MZI space switch with a 0.64-mm phase shifter using quantum-well electrorefraction.  Dorren, B.H.P.; Haverkort, J.E.M.; Prasanth, R.; Groen, F.H.; Wolter, J.H. , IEEE Photonics Technology Letters (2001)  Volume: 13, Issue: 1 , 37 -39. Abstract   Full text
Nonlinear absorption and optical limiting in solutions of some rare earth substituted phthalocyanines.     Unnikrishnan, K. P.; Thomas, Jayan; Paul, Binoy; Kurian, Achamma; Gopinath, Pramod; Nampoori, V. P. N.; Vallabhan, C. P. G.J. Nonlinear Opt. Phys. Mater.  (2001),  10(1),  113-121.  Abstract   Full text 
Optical absorption and emission spectral studies of phthalocyanine molecules in DMF.   Kumar, G. A.; Thomas, J.; Unnikrishnan, N. V.; Nampoori, V. P. N.; Vallabhan, C. P. G. J. Porphyrins Phthalocyanines  (2001),  5(5), 56-459.     Abstract   Full text   
Optical properties of phthalocyanine molecules in cyano acrylate polymer matrix.  Kumar, G. A.; Thomas, J.; Unnikrishnan, N. V.; Nampoori, V. P. N.; Vallabhan, C. P. G.Mater. Res. Bull.  (2001),  36(1-2),  1-8.  Abstract   Full text 
Effect of the excitation source on the quantum-yield measurements of Rhodamine B laser dye studied using thermal-lens technique.  Bindhu, C. V.; Harilal, S. S., Anal. Sci.  (2001),  17(1),141-144                                                   
Photoacoustic evaluation of the thermal effusivity in the isotropic phase of certain comb-shaped polymers.   George, Nibu A.; Vallabhan, C. P. G.;Nampoori, V. P. N.; George, A. K.; Radhakrishnan, P., J. Phys.: Condens. Matter  (2001),  13(3),  365-371.  Abstract   Full text
Expansion dynamics of laser ablated carbon plasma plume in helium ambient.  Harilal, S. S. Appl. Surf. Sci.  (2001),  172(1-2),  103-109. Abstract   Full text
Effect of excitation source on the quantum yield measurements of rhodamine B using thermal lens technique.  Bindhu CV and Harilal SS Analytical Sciences  (2001),  17, 141-44.   Abstract   Full text
 
Top of the pagePublications-2000
Use of photoacoustic effect for the detection of phase transitions in liquid crystal mixtures.  Nibu A.; Vallabhan, C. P. G.; Nampoori, V. P. N.; George, A. K.; Radhakrishnan, P., J. Phys. D: Appl. Phys.(2000), 33(24),3228 Astract   Full text                   
Numerical studies on bi-directionally coupled directly modulated semiconductor lasers.     Bindu, V.; Nandakumaran, V. M. , Phys. Lett. A  (2000),  277(6),  345-351.  Abstract   Full text
Emission spectral studies of phthalocyanines in borate glass matrix.    Kumar, G. A.; Nampoori, V. P. N.; Vallabhan, C. P. G.; Jose, G.; Unnikrishnan, N. V. , J. Mater. Sci. Lett.  (2000),  19(18),  1669-1672. Abstract   Full text  
Spectral studies of naphthalocyanine (Nc) and rare earth phthalocyanine (RePc) molecules in an inorganic glassy borate matrix.     Kumar, G. A.; Thomas, J.; George, N.; Nampoori, V. P. N.; Radhakrishnan, P.; Vallabhan, C. P. G.; Unnikrishnan, V. Phys. Chem. Glasses  (2000),  41(4),  199-203.  Abstract   Full text
Optical studies of phthalocyanine molecules in PVA film.     Thomas, J.; Kumar, G. A.; Unnikrishnan, N. V.; Nampoori, V. P. N.; Vallabhan, C. P. G. , Mater. Lett.  (2000),  44(5),  275-278.  Abstract   Full text
Physical and optical properties of phthalocyanine doped inorganic glasses.  Kumar, G. A.; Thomas, J.; George, N.; Unnikrishnan, N. V.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.J. Mater. Sci.(2000) 35(10),2539.           Abstract   Full text
Optical absorption studies of free (H2Pc) and rare earth (RePc) phthalocyanine doped borate glasses.     Kumar, G. A.; Thomas, J.; George, N.; Kumar, B. A.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.; Unnikrishnan, N. V.,  Phys. Chem. Glasses  (2000),  41(2),  89-93. Abstract   Full text
Dynamics of two coupled chaotic multimode Nd:YAG lasers with intracavity frequency doubling crystal.     Kuruvilla, Thomas; Nandakumaran, V. M. ,  Pramana  (2000),  54(3),  393-402. Abstract   Full text
Experimental investigation of optical limiting and thermal lensing in toluene solutions of C70.     Bindhu, C. V.; Harilal, S. S.; Nampoori, V. P. N.; Vallabhan, C. P. G.  , Appl. Phys. B: Lasers Opt.  (2000),  70(3),  429-434.  Abstract   Full text
Photoacoustic investigation of the effect of excess lead oxide on thermal diffusivity of PLZT ceramic.     George, N. A.; Paul, T.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.; Sebastian, M. T.  ,   J. Mater. Sci. Lett.  (2000),  19(6),  499-501. Abstract   Full text
Fading of thermoluminescence from CaS and CaS:Ce phosphors. Joseph, James; Ananthakrishnan, T. R.; Nampoori, V. P. N.; Warier, M. K. Rudra. Indian J. Phys., A (2000), 74A(1), 21-24.   
 
Top of the pagePublications-1999
Thermal diffusivity of some polymer supported halogeno benzimidazole complexes of cobalt(II) and copper(II) - a photoacoustic study.     Raman, S. Sankara; Nampoori, V. P. N.; Vallabhan, C. P. G.; Saravanan, N.; Yusuff, K. K. Mohammed.J. Mater. Sci. Lett.  (1999),  18(23),  1887-1889.  Abstract   Full text  
Solvent effect on absolute fluorescence quantum yield of rhodamine 6G determined using transient thermal lens technique.     Bindhu, C. V.; Harilal, S. S.; Nampoori, V. P. N.; Vallabhan, C. P. G.Mod. Phys. Lett. B  (1999),           13(16),  563-576.  Abstract   Full text
Evaluation of electrical conductivity and thermal diffusivity of vanadyl naphthalocyanine.     Thomas, J.; Pillai, V. N. S.; Nampoori, V. P. N.; Vallabhan, C. P. G., J. Mater. Sci. Lett.  (1999),  18(12),  963-964.  Abstract   Full text
Photoacoustic study on photobleaching of Rhodamine 6G doped in poly(methyl methacrylate).     George, Nibu A.; Aneeshkumar, B.; Radhakrishnan, P.; Vallabhan, C. P. G.J. Phys. D: Appl. Phys.  (1999), 32(14),1745. Abstract    Full text
Optical limiting and thermal lensing studies in C60.     Harilal, S. S.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G., J. Appl. Phys.  (1999),  86(3),  1388-1392. Abstract   Full text
Monitoring the rate of pulsed laser deposition of silver thin films using a fiber optic sensor.     John, M. Shelly; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.    Proc. SPIE-Int. Soc. Opt. Eng.  (1999),  3666(Photonics India '98),  574-577                                                                                        
Investigation of nonlinear absorption and aggregation in aqueous solutions of rhodamine B using thermal lens technique.     Bindhu, C. V.; Harilal, S. S.; Nampoori, V. P. N.; Vallabhan, C. P. G., Pramana  (1999),  52(4),  435-442. 
Suppression of chaos through reverse period doubling in coupled directly modulated semiconductor lasers.     Kuruvilla, Thomas; Nandakumaran, V. M.    Phys. Lett. A  (1999),  254(1,2),  59-64.  Abstract   Full text
Studies of nonlinear absorption and aggregation in aqueous solutions of rhodamine 6G using a transient thermal lens technique.     Bindhu, C. V.; Harilal, S. S.; Nampoori, V. P. N.; Vallabhan, C. P. G. , J. Phys. D: Appl. Phys.  (1999),  32(4),  407-411.  Abstract   Full text
A fiber optic evanescent wave sensor for monitoring the rate of pulsed laser deposition of metal thin films.     John, M. Shelly; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G. ,Meas. Sci. Technol.  (1999),  10(2),  n17-n20.  Abstract   Full text
Photoacoustic study of the effect of hydroxyl ion on thermal diffusivity of g alumina.     Sankara Raman, S.; Nampoori, V. P. N.; Vallabhan, C. P. G.; Ambadas, G.; Sugunan, S. , J. Appl. Phys.  (1999),  85(3),  1987-1988. Abstract   Full text
Significance of time scales in nonlinear dynamical analysis of electroencephalogram signals. Indic P; Pratap R; Nampoori V P; Pradhan N International Journal Of Neuroscience (1999 Aug), 99(1-4), 181-94. 
 
Top of the pagePublications-1998
Two and three photon absorption in rhodamine 6G methanol solutions using pulsed thermal lens technique.     Bindhu, C. V.; Harilal, S. S.; Kurian, Achamma; Nampoori, V. P. N.; Vallabhan, C. P. G. J. Nonlinear Opt. Phys. Mater.  (1998),  7(4),  531-538.                                                               
Thermal diffusivity measurements in organic liquids using transient thermal lens calorimetry.     Bindhu, C. V.; Harilal, S. S.; Nampoori, V. P. N.; Vallabhan, C. P. G.,    Opt. Eng. (Bellingham, Wash.)  (1998),  37(10),  2791-2794.    Abstract   Full text
A molecular electrostatic potential mapping study of some fluoroquinolone anti-bacterial agents.     Chidangil, Santhosh; Shukla, Manoj K.; Mishra, Phool C.    J. Mol. Model.  (1998),  4(8),  250-258.  Abstract   Full text
An optical fiber based evanescent wave sensor to monitor the deposition rate of thin films.     Jose, Deepa; John, M. Shelly; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G. , Thin Solid Films  (1998),  325(1,2), 264-267. Abstract   Full text
Twin peak distribution of electron emission profile and impact ionization of ambient molecules during laser ablation of silver target.     Issac, Riju C.; Gopinath, Pramod; Varier, Geetha K.; Nampoori, V. P. N.; Vallabhan, C. P. G. , Appl. Phys. Lett.  (1998),  73(2),  163-165. Abstract   Full text

Use of mirage effect for the detection of phase transitions in liquid crystals.  Rajasree, K.; Vidyalal, V.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.; George, A. K. , Cochin,  India.    Mater. Lett.  (1998),  36(1-4),  76-80. Abstract   Full text

Dynamics of laser produced silver plasma under film deposition conditions studied using optical emission spectroscopy.     Issac, Riju C.; Vasudevan Pillai, K.; Harilal, S. S.; Varier, Geetha K.; Bindhu, C. V.; Gopinath, Pramod; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G. , Appl. Surf. Sci.  (1998),  125(2),  227-235.  Abstract   Full text
Influence of ambient gas on the temperature and density of laser produced carbon plasma.     Harilal, S. S.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G.,  Appl. Phys. Lett.  (1998),  72(2),  167-169.  Abstract   Full text  
Prompt electron emission and collisional ionization of ambient gas during pulsed laser ablation of silver. Issac, R. C.; Varier, G. K.; Gopinath, P.; Harilal, S. S.; Nampoori, V. P. N.; Vallabhan, C. P. G. Appl. Phys. A: Mater. Sci. Process. (1998), A67(5), 557-561.  Abstract   Full text
Collective behavior of laser-produced plasma from a multicomponent YBa2Cu3O7 target in air. Issac, R. C.; Varier, G. K.; Harilal, S. S.; Nampoori, V. P. N.; Vallabhan, C. P. G. Appl. Phys. B: Lasers Opt. (1998), B67(5), 647-651.        Abstract   Full text       
Time evolution of the electron density and temperature in laser-produced plasmas from YBa2Cu3O7. Harilal, S. S.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G. Appl. Phys. B: Lasers Opt. (1998), B66(5), 633-638.                 Abstract   Full text               
Temporal and spatial behavior of electron density and temperature in a laser-produced plasma from YBa2Cu3O7. Harilal, S. S.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G. Appl. Spectrosc. (1998), 52(3), 449-455.     Abstract
 
Top of the pagePublications-1997
Anomalous profile of a self-reversed resonance line from Ba+ in a laser produced plasma from YBa2Cu3O7.     Issac, Riju C.; Harilal, S. S.; Bindhu, C. V.; Varier, Geetha K.; Nampoori, V. P. N.; Vallabhan, C. P. G.    ,   Spectrochim. Acta, Part B  (1997),  52B(12),  1791-1799.  Abstract   Full text
Fine structure in the time of flight distribution of C2 in laser produced plasma from graphite.     Harilal, S. S.; Issac, Riju C.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G.   ,  Pramana  (1997),  49(3),  317-322.          
Spatial analysis of C2 band emission from laser produced plasma.  Harilal, S. S.; Issac, Riju C.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G. , Plasma Sources Sci. Technol.  (1997),  6(3),  317-322.  Abstract   Full text
Time resolved study of CN band emission from plasma generated by laser irradiation of graphite.     Harilal, S. S.; Issac, Riju C.; Bindhu, C. V.; Gopinath, Pramod; Nampoori, V. P. N.; Vallabhan, C. P. G. , Spectrochim. Acta, Part A  (1997),  53A(10),  1527-1536.   Abstract   Full text
Electron density and temperature measurements in a laser produced carbon plasma.     Harilal, S. S.; Bindhu, C. V.; Issac, Riju C.; Nampoori, V. P. N.; Vallabhan, C. P. G.     J. Appl. Phys.  (1997),  82(5),  2140-2146. Abstract   Full text
Optical emission studies of C2 species in laser-produced plasma from carbon.  Harilal, S. S.; Issac, Riju C.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G.    J. Phys. D: Appl. Phys.  (1997),  30(12), 1703-1709. Abstract   Full text
Emission characteristics and dynamics of C2 from laser-produced graphite plasma.  Harilal, S. S.; Issac, Riju C.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G. , J. Appl. Phys.  (1997),  81(8, Pt. 1),  3637-3643. Abstract   Full text
Photoacoustic signal saturation and optical limiting in C70-toluene solution.  Issac, Riju C.; Harilal, S. S.; Varier, Geetha K.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G.,  Opt. Eng. (Bellingham, Wash.)  (1997),  36(2),  332-336. 
Induction of mitotic chromosomal aberrations by lasers in comparison to gamma radiations. Pillai, P. R. Unnikrishna; Nambisan, Padma; Nampoori, V. P. N.; Vallabhan, C. P. G.. Yichuan (1997), 19(5), 5-9. 
Possibility of waveguide formation on organic nonlinear crystal methyl para-hydroxy benzoate using high energy ion irradiation. Sreeramana Aithal, P.; Nagaraja, H. S.; Mohan Rao, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.; Avasthi, D. K. Nucl. Instrum. Methods Phys. Res., Sect. B (1997), 129(2), 217-220. 
Investigations on nanosecond laser produced plasma in air from the multi-component material YBa2Cu3O7. Varier, Geetha K.; Isaac, Riju C.; Harilal, S. S.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G. Spectrochim. Acta, Part B (1997), 52B(5), 657-666. 
Time resolved analysis of C2 emission from laser induced graphite plasma in helium atmosphere. Harilal, S. S.; Issac, Riju C.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G.. Jpn. J. Appl. Phys., Part 1 (1997), 36(1A), 134-138. Abstract   Full text
 
Top of the pagePublications-1996
A fiber optic sensor to measure surface tension.     Deepthy, A.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G. , J. Phys., B  (1996),  70B(6),  527-530                                                                                   
Photoacoustic studies on multilayer dielectric coatings.     Philip, Annieta; Radhakrishnan, P.; Nampoori, V. P.; Vallabhan, C. P. G. J. Phys. D:  Appl. Phys.  (1996),  29(5),  1387-1388.   Abstract   Full text
Spatial and time resolved analysis of CN bands in the laser induced plasma from graphite. Harilal, S. S.; Issac, Riju C.; Bindhu, C. V.; Varier, Geetha K.; Nampoori, V. P. N.; Vallabhan, C. P. G.,  Pramana  (1996),  46(2),  145-151 
Measurement of thermal diffusivity of some halogeno benzimidazole complexes of cobalt(II), copper(II) and copper(I) using laser induced photoacoustic effect.  Raman, S. Sankara; Nampoori, V. P. N.; Vallabhan, C. P. G.; Saravanan, N.; Yusuff, K. K. Mohammed.  J. Mater. Sci. Lett. (1996), 15(3),230  
Photoemission optogalvanic studies with copper as target electrode. K.C. Ajithprasad, VPN Nampoori and CPG Vallabhan, App. Surf. Sci.,(1996),103 (4), 465. Abstract   Full text
Pulsed photoacoustic determination of absolute fluorescent quantum yield of the laser dye rhodamine B. Bindhu, C. V.; Harilal, S. S.; Issac, Riju C.; Nampoori, V. P. N.; Vallabhan, C. P. G.  Mod. Phys. Lett. B (1996), 10(22), 1103-1110. 
Characterization of potassium doped GdBa2Cu3O7-d using Raman spectroscopy and x-ray diffraction. [Erratum to document cited in CA124:329709]. Thomas, Preethi Cicily; Manoj, Jumar K.; Nayar, V. Unnikrishnan; Vidyalal, V.; Vallabhan, C. P. G. Mod. Phys. Lett. B (1996), 10(23), 1159. 
Study of laser ablation in liquids using pulsed photoacoustic technique. Harilal, S. S.; Issac, Riju C.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G. Mod. Phys. Lett. B (1996), 10(21), 1053-1057. 
Temporal and spatial evolution of C2 in laser-induced plasma from graphite target.  Harilal, S. S.; Issac, Riju C.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G. J. Appl. Phys. (1996), 80(6), 3561-3565.  Abstract   Full text
Measurements of electromagnetic shielding effect using HTSC materials. Vidyalal, V.; Rajasree, K.; Vallabhan, C. P. G.. Opto-Electronic Lab., Cochin Univ. of Sci. and Technology, Cochin, India. Mod. Phys. Lett. B (1996), 10(7), 293-297. 
Electron density determination of laser induced plasma from polymethyl methacrylate using phaseshift detection techniques. Varier, Geetha K.; Harilal, S. S.; Bindhu, C. V.; Issac, Riju C.; Nampoori, V. P. N.; Vallabhan, C. P. G.. Mod. Phys. Lett. B (1996), 10(6), 235-239. 
A study of photoacoustic effects and optical limiting in the solution of C60 in toluene. Issac, Riju C.; Bindhu, C. V.; Harilal, S. S.; Varier, Geetha K.; Nampoori, V. P. N.; Vallabhan, C. P. G. Mod. Phys. Lett. B (1996), 10(1 & 2), 61-67.  
Measurement of the absolute fluorescence quantum yield of rhodamine B solution using a dual-beam thermal lens technique. Bindhu, C. V.; Harilal, S. S.; Varier, Geetha K.; Issac, Riju C.; Nampoori, V. P. N.; Vallabhan, C. P. G. J. Phys. D: Appl. Phys. (1996), 29(4), 1074-9.  Abstract   Full text
Measurement of the absolute fluorescence quantum yield of rhodamine B solution using a dual-beam thermal lens technique. Bindhu, C. V.; Harilal, S. S.; Varier, Geetha K.; Issac, Riju C.; Nampoori, V. P. N.; Vallabhan, C. P. G. J. Phys. D: Appl. Phys. (1996), 29(4), 1074-9.  Abstract   Full text
Electrical conductivity and thermal diffusivity of zinc naphthalocyanine. Thomas, J.; Pillai, V. N. Sivasankara; Xavier, E.; Vallabhan, C. P. G.. J. Mater. Sci. Lett. (1996), 15(2), 151-2. 
Evanescent wave sensor to monitor the etching rate of an optical fiber. Lovely, M. R.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G. Indian J. Pure Appl. Phys. (1996), 34(1), 34-5. 
 

Top of the pagePublications-1995

Photoacoustic study of the effect of degassing temperature on thermal diffusivity of hydroxyl loaded alumina. Raman, S. Sankara; Nampoori, V. P. N.; Vallabhan, C. P. G.; Ambadas, G.;Sugunan,S. Appl. Phys. Lett.(1995),67(20),2939 Abstract   Full text
Photoemission optogalvanic effect near the instability region of a hollow cathode discharge. Sasi Kumar, P. R.; Nampoori, V. P. N.; Vallabhan, C. P. G, Optical Communication  (1995),  118(5,6),  525-8.  Abstract   Full text
Characterization of potassium-doped GdBa2Cu3O7-d using Raman spectroscopy and x-ray diffraction. Thomas, Preethi Cicily; Manoj, Kumar K.; Nayar, V. Unnikrishnan; Vidyalal, V.; Vallabhan, C. P. G . Mod. Phys. Lett. B (1995), 9(26 & 27), 1739-52. 
Laser induced thermal lens effect in rhodamine B - signature of resonant two photon absorption. Bindhu, C. V.; Harilal, S. S.; Issac, Riju C.; Varier, Geetha K.; Nampoori, V. P. N.; Vallabhan, C. P. G.. Mod. Phys. Lett. B (1995), 9(22), 1471-7. 
CW-Ar+ laser induced structural and optical properties of amorphous Sb2Se3 films. Jayakumar, S.; Balasubramanian, C.; Narayandass, Sa. K.; Mangalaraj, D.; Vallabhan, C. P. G. Vallabhan. Mater. Res. Bull. (1995), 30(9), 1141-51. 
Observation of multiphoton process in liquid CS2 using pulsed photoacoustic technique. Harilal, S. S.; Issac, Riju C.; Bindhu, C. V.; Varier, Geetha K.; Nampoori, V. P. N.; Vallabhan, C. P. G. Mod. Phys. Lett. B (1995), 9(14), 871-6. 
Pulsed photoacoustic technique to study nonlinear processes in liquids: results in toluene. Bindhu, C. V.; Harilal, S. S.; Issac, Riju C.; Varier, Geetha K.; Nampoori, V. P. N.; Vallabhan, C. P. G. Pramana (1995), 44(3), 231-5. 
Anomalous variation of thermal lens signal with concentration from Rhodamine B in methanol solution. Bindhu, C. V.; Harilal, S. S.; Issac, Riju C.; Varier, Geetha K.; Nampoori, V. P. N.; Vallabhan, C. P. G. Pramana (1995), 44(3), 225-9. 
Subcritical Hopf bifurcation in Ne-Nd hollow cathode discharge.  Sasi Kumar, P. R.; Nampoori, V. P. N.; Vallabhan, C. P. G. Phys. Lett. A (1995), 199(5,6), 416
Detection of phase transitions in liquid crystals using the mirage effect. Rajasree, K.; Vidyalal, V.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.; george, A. K. Liq. Cryst. (1995), 18(1), 167-9. 
 

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