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Research Publications

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Papers published in International Journals





Optimization of an optical chopper-laser beam arrangement in low-frequency applications
Nibu A George, Nibu B Thomas, Haroon Hussain Moidu, and Piyush K
Optik- International Journal for Light and Electron Optics 126 (23), 36283630 (2015)

Tailoring of optical properties of fluorescein using green synthesized gold nanoparticles
Jisha John, Lincy Thomas, Nibu A George, Achamma Kurian, Sajan D George
Physical Chemistry Chemical Physics 17, 15813-15821, (2015)

Thermal diffusivity of gold nanoparticle reduced by polyvinyl alcohol using dual beam thermal lens technique
Lincy Thomas, Jisha John, Rajesh Kumar .B, Nibu A George, Achamma Kurian
Materials Today, Volume 2, Issue 3, 10171020, (2015)

Single-beam thermal lens measurement of thermal diffusivity of engine coolants
Nibu A George, Nibu B Thomas, Kavya Chacko, Neethu V. T, Haroon Hussain Moidu, Nitheesh M David
Nondestructive Testing and Evaluation 30 (2), 165-170 (2015)

Silver nanoparticle assisted urine sugar determination using thermal lens spectroscopy
Lincy Thomas, Jisha John, Nibu A George, Achamma Kurian
Measurement Science and Technology 25 (11), 115701 (2014)

Microbend fiber optic detection of continuously varying refractive index of chlorinated water.
Nibu A George, Anu Maria Paul and M S Saranya,
Optik - International Journal for Light and Electron Optics (2014)

A simple optical sensor for the measurement of dry rubber content in natural rubber latex.
Nibu A George, Akhila Peethan and Midhula Vijayan,
Journal of Nondestructive Testing and Evaluation (2013)

Depth-Kymography of vocal fold vibrations: part II. Simulations and direct comparisons with 3D profile measurements.
F F M de Mul, Nibu A George, Q Qiu, G Rakhorst and H K Schutte,
Physics in Medicine and Biology, 54, 3955-3977 (2009)

A new laryngoscope for quantitative high-speed imaging of human vocal folds vibration in the vertical and horizontal directions .
Nibu A George, F F M de Mul, Q Qiu, G Rakhorst and H K Schutte,
Journal of Biomedical Optics, 13(6) (2008)

Depth-Kymography: High-speed calibrated 3D imaging of human vocal fold vibration dynamics . {Invented a new 3D Endoscope and the new term "Depth-Kymography" is introduced to the scientific world, which later included in the Current Medical Terminology}
Nibu A George, F F M de Mul, Q Qiu, G Rakhorst and H K Schutte,
Physics in Medicine and Biology, 53, 2667-2675 (2008)
(This paper won Editors Choice (IOP Select) award. Also one among the top 30 most downloaded paper in 2008.)

Evidence of band structure modification due to Jahn-Teller distortion in LixMn2O4 by photoacoustic spectroscopy (pdf)
S Thomas Lee, K Raneendranath, Rajiv M Tomy, Nibu A George, S Jayalakshmi and Jyotsna Ravi,
Journal of Physics D: Applied Physics, 40, 3807-3810 (2007)

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 27, 1593-1595 (2005)

Measurement of velocity-temperature correlations in a turbulent diffusion flame
M J Tummers, E H van Veen, Nibu George, R Rodnik and K Hanjalic
Experiments in Fluids 37, 364-374 (2004)

Fiber optic position sensitive detection of photothermal deflection
Nibu A George
Applied Physics B: Lasers and Optics 77(1), 77-80 (2003)

Thermal diffusivity of liquid crystalline polymers measured using open cell photoacoustic technique
Nibu A George
Smart Materials and Structures 11, 561-564 (2002)

Photothermal deflection studies on GaAs epitaxial layers
Nibu A George, C P G Vallabhan, V P N Nampoori and P Radhakrishnan
Applied Optics 41, 579-584(2002)

Photoacoustic studies on n-type Indium Phosphide
Nibu A George, C P G Vallabhan, V P N Nampoori and P Radhakrishnan
Optical Engineering, 41(1), 251-254 (2002)

Photoacoustic evaluation of the thermal diffusivity of coconut shell
Nibu A George and Vinayakrishnan R
Journal of Physics: Condensed Matter 14, 4509-4513 (2002); DELTA, the weekly news paper from Delft, published a special report about this work in july 2002

Effect of pH on quantum yield of fluorescein measured using thermal lens technique
A Kurian, Nibu A George, S D George, K P Unnikrishnan, B Paul, P Gopinath, V P N Nampoori and C P G Vallabhan,
Journal of Optics, 31, 29-36, (2002)

Studies on fluorescence efficiency and photodegradation of rhodamine 6G doped PMMA using a dual beam thermal lens technique
A Kurian, Nibu A George, B Paul, V P N Nampoori and C P G Vallabhan,
Laser Chemistry, 20, 99-110 (2002)

Photoacoustic evaluation of the thermal effusivity of the liquid crystals 7OCB and 8OCB )
Nibu A George, C P G Vallabhan, V P N Nampoori, A K George and P Radhakrishnan,
Applied Physics B: Lasers and Optics, 73, 145-149 (2001)

Thermal wave propagation in multilayer samples: A laser-induced photoacoustic investigation
Nibu A George and Vinayakrishnan R
Lasers in Engineering 11, 283-292 (2001)

Laser induced photoacoustic technique for the detection of phase transitions in liquid crystals
Nibu A George, C P G Vallabhan, V P N Nampoori, A K George and P Radhakrishnan,
Journal of Nondestructive Testing and Eval.,17(6), 315-324 (2001)

Open-cell photoacoustic investigation of the thermal effusivity of liquid crystals
Nibu A George, C P G Vallabhan, V P N Nampoori, A K George and P Radhakrishnan,
Optical Engineering, 40(7), 1343-1347 (2001)

Photoacoustic evaluation of the thermal effusivity in the isotropic phase of certain comb-shaped polymers
Nibu A George, C P G Vallabhan, V P N Nampoori, A K George and P Radhakrishnan,
Journal of Physics: Condensed Matter, 13, 365-371 (2001)

Chemical sensing with microbent optical fiber
Thomas Lee S, Nibu A George, P Sureshkumar, V P N Nampoori, C P G Vallabhan
and P Radhakrishnan
Optics Letters, 26 (20), 1541-1543 (2001)

Use of photoacoustic effect for the detection of phase transitions in liquid crystal mixtures
Nibu A George, C P G Vallabhan, V P N Nampoori, A K George and P Radhakrishnan,
Journal of Physics D: Applied Physics, 33, 3228-3232 (2000)

Photoacoustic investigation of the effect of excess lead oxide on thermal diffusivity of PLZT ceramic
Nibu A George, T Paul, P Radhakrishnan, V P N Nampoori, C P G Vallabhan and M T Sebastian,
Journal of Materials Science Letters, 19, 499-501 (2000)

Physical and optical properties of phthalocyanine doped inorganic glasses
G A Kumar, J Thomas, Nibu George, N V Unnikrishnan, P Radhakrishnan, V P N Nampoori and C P G Vallabhan,
Journal of Materials Science, 35(10), 2539-2542 (2000)

Optical absorption studies of free and rare earth phthalocyanine doped borate glasses
G A Kumar, J Thomas, Nibu George, B A Kumar, P Radhakrishnan, V P N Nampoori, C P G Vallabhan and N V Unnikrishnan,
Physics and Chemistry of Glasses, 41(2), 89-93 (2000)

Spectral studies of naphthalocyanine (Nc) and rare earth phthalocyanine (RePc) molecules in an inorganic glassy borate matrix
G A Kumar, J Thomas, Nibu George, V P N Nampoori, P Radhakrishnan, C P G Vallabhan and N V Unnikrishnan,
Physics and Chemistry of Glasses, 41(4), 199-203 (2000)

Photoacoustic study on photobleaching of Rhodamine 6G doped in poly methyl methacrylate
Nibu A George, B Aneeshkumar, P Radhakrishnan and C P G Vallabhan,
Journal of Physics D: Applied Physics, 32, 1745-1749 (1999)

Papers presented in International Conferences

3D modelling of vocal folds dynamics (poster - pdf)
Frits F M de Mul, Nibu George and H K Schutte
Pan European Voice Conference; (Groningen, The Netherlands) August 29-September 1, 2007

Femtosecond mid-infrared light source at 4kHz repetition rate (poster - pdf)
Nibu George, G.D. Cringus, M. S. Pshenichnikov and D. A. Wiersma
Atomic Molecular and Optical Physics Conference; (Lunteren, The Netherlands) November 11-12, 2004

Combined LDA-Cars Measurements of Velocity-Temperature Correlations in Turbulent Flames
Tummers, M.J., Veen, E.H. van, Nibu George., Rodink, R., Hanjalic, K,
Third International Symposium on Turbulence and Shear Flow Phenomena; Proceedings Vol. 3, pp 1013-1018, editors: N. Kasagi et al, (Sendai, Japan) June 25-27, 2003

Measurements of velocity-temperature correlations in a turbulent diffusion flame
Nibu George, R Rodink, E van Veen, M Tummers and K Hanjalic
11th International Symposium on Applications of Laser Techniques to Fluid Mechanics; (Calouste Gulbenkian Foundation, Lisbon, Portugal) July 8-11, 2002

Photoacoustic study of thermotropic liquid crystals
Nibu A George, C P G Vallabhan, V P N Nampoori, P Radhakrishnan, C Carboni and A K George
5th Gordon Research Conference on Photoacoustic and Photothermal Phenomena, (Queens College, Oxford, UK) Aug 19-24, 2001

Passive organic solid-state optical limiter based on enhanced excited state absorption
B Aneeshkumar, P Gopinath, J Thomas, Nibu A George, P Radhakrishnan, V P N Nampoori and C P G Vallabhan,
SPIE's 44th Annual Meeting - The International Symposium on Optical Science, Engineering, and Instrumentation; (Colorado Convention Center, USA) July 18-23, 1999

Photoacoustic Monitoring of Nematic to Isotropic Transition in the Liquid Crystal BL001
Nibu A George, C P G Vallabhan, V P N Nampoori, A K George and P Radhakrishnan,
International Conference on Laser Devices and Materials, (DSC, New Delhi, India), Dec 8-10, 1999

Optical limiter using samarium phthalocyanine (SmPc) doped copolymer matrix
B Aneeshkumar, P Gopinath, J Thomas, Nibu A George, G Kumar, P Radhakrishnan, V P N Nampoori and C P G Vallabhan
International Symposium on Photonics and Applications (SPIE), Singapore) 29 Nov.-3 Dec. 1999

Photoacoustic study on photobleaching of Rhodamine 6G doped in poly methyl methacrylate
Nibu A George, B Aneeshkumar, P Radhakrishnan and C P G Vallabhan,
International Conference on Optics and Optoelectronics; (IRDE, Dehradun, India), Dec 9-12, 1998


Papers presented in National Conferences

Photoacoustic evaluation of thermal diffusivity of Indium Phosphide
Nibu A George, C P G Vallabhan, V P N Nampoori and P Radhakrishnan,
National Conference on Materials Science (M G University, Kottayam, India) Mar.23-24, 2001

Use of photoacoustic effect for the detection of phase transitions in polymer dispersed liquid crystal mixtures
Nibu A George, C P G Vallabhan, V P N Nampoori, A K George and P Radhakrishnan,
National Laser Symposium (Defense Science Centre, New Delhi, India) Dec 13-15, 2000

Photoacoustic evaluation of the thermal effusivity of the liquid crystals 7OCB and 8OCB
Nibu A George, C P G Vallabhan, V P N Nampoori, A K George and P Radhakrishnan,
National Laser Symposium (Defense Science Centre, New Delhi, India) Dec 13-15, 2000

Photoacoustic study of phase transitions in liquid crystals
Nibu A George, C P G Vallabhan, V P N Nampoori, A K George and P Radhakrishnan,
National Seminar on High Power Lasers, (CUSAT, Cochin, India), Feb 26-27, 1999

Investigations on the photobleaching of Rhodamine 6G doped in poly methyl methacrylate using photoacoustic technique
Nibu A George, B Aneeshkumar, P Radhakrishnan and C P G Vallabhan,
National Laser Symposium, (IIT Kanpur, India), Dec 14-16, 1998

Effect of poly(vinyl alcohol) concentration on fluorescence parameters of Rh-B laser dye
B Aneeshkumar, Nibu A George, P Radhakrishnan, V P N Nampoori and C P G Vallabhan
National Laser Symposium (IIT Kanpur, India), Dec 14-16, 1998

Ph.D Thesis

Photoacoustic and photothermal deflection studies on certain selected photonic materials (pdf 1.7MB)

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