Home I People I Faculty I Prof.  P. Radhakrishnan I Publications 
 
Last modified: March 05, 2010                                                                                                (recent publications-see below)
1. Fiber optic pH sensor with dye-doped multilayer sol-gel coatings.     Lee, Thomas S.; Jose, Gin; Manju, C. M.; Joseph, Betty; John, M. Shelly; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.; Unnikrishnan, N. V.    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Proc. SPIE-Int. Soc. Opt. Eng.  (2001),  4417(Photonics 2000),  546-554. 
2. Chemical sensing with microbent optical fiber.     Thomas, Lee S.; George, Nibu A.; Sureshkumar, P.; Radhakrishnan, P.; Vallabhan, C. P. G.; Nampoori, V. P. N.    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Optics Letters  (2001),  26(20),  1541-1543. 
3. A sensitive fiber 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..    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    J. Opt. A: Pure Appl. Opt.  (2001),  3(5),  355-359. 
4. 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..    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Appl. Phys. B: Lasers Opt.  (2001),  73(2),  145-149
5. 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..    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Opt. Eng. (Bellingham, WA, U. S.)  (2001),  40(7),  1343-1347. 
6. 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..    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Journal of Physics: Condensed Matter  (2001),  13(3),  365-371. 
7. Use of photoacoustic effect for the detection of phase transitions in liquid crystal mixtures.     George, Nibu A.; Vallabhan, C. P. G.; Nampoori, V. P. N.; George, A. K.; Radhakrishnan, P..    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    J. Phys. D: Appl. Phys.  (2000),  33(24),  3228-3232. 
8. Rapid tooling for casting - a study on the application of rapid prototyping process.     Susila, Ms B.; Karthik, K.; Radhakrishnan, P..    CAD/CAM Centre,  PSG College of Technology,  Coimbatore,  India.    Indian Foundry J.  (1999),  45(11),  TP213-TP216. 
9. 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.    Solid State Electronics Division,  International School of Photonics, Cochin University of Science and Technology,  Kochi,  India.    Phys. Chem. Glasses  (2000),  41(4),  199-203. 
10. NO2 detection with a fiber optic evanescent wave sensor.     Mechery, John Shelly; Thomas, Jayan; Unnikrishnan, K. P.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.    International School of Photonics,  Cochin Univ. of Science and Technology,  Cochin,  India.    Proc. SPIE-Int. Soc. Opt. Eng.  (1999),  3897(Advanced Photonic Sensors and Applications),  173-178. 
11. 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.    Solid State Electronics Division, International School of Photonics,  Cochin University of Science and Technology,  Kochi,  India.    J. Mater. Sci.  (2000),  35(10),  2539-2542. 
12. 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.    Solid State Electronics Division, International School of Photonics,  Cochin University of Science and Technology,  Kochi,  India.    Phys. Chem. Glasses  (2000),  41(2),  89-93
13. 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.    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    J. Mater. Sci. Lett.  (2000),  19(6),  499-501. 
14. Photoacoustic study on photobleaching of Rhodamine 6G doped in poly(methyl methacrylate).     George, Nibu A.; Aneeshkumar, B.; Radhakrishnan, P.; Vallabhan, C. P. G.    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    J. Phys. D: Appl. Phys.  (1999),  32(14),  1745-1749. 
15. 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.    International School of Photonics,  Cochin Univ. of Science and Technology,  Cochin,  India.    Proc. SPIE-Int. Soc. Opt. Eng.  (1999),  3666(Photonics India '98),  574-577. 
16. 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.    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Meas. Sci. Technol.  (1999),  10(2),  n17-n20. 
17. 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.    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Thin Solid Films  (1998),  325(1,2),  264-267. 
18. 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.    International School of Photonics, Opto-Electronics Laboratory,  Cochin University of Science and Technology,  Cochin,  India.    Mater. Lett.  (1998),  36(1-4),  76-80. 
19. 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.    International School of Photonics, Laser Division,  Cochin University of Science and Technology,  Cochin,  India.    Appl. Surf. Sci.  (1998),  125(2),  227-235. 
20. A fiber optic sensor to measure surface tension.     Deepthy, A.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Indian J. Phys., B  (1996),  70B(6),  527-530. 
21. Photoacoustic studies on multilayer dielectric coatings.     Philip, Annieta; Radhakrishnan, P.; Nampoori, V. P.; Vallabhan, C. P. G.    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    J. Phys. D:  Appl. Phys.  (1996),  29(5),  1387-1388. 
22. 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.    International School Photonics,  Cochin University Science & Technology,  Cochin,  India.    Indian J. Pure Appl. Phys.  (1996),  34(1),  34-5. 
23. 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.    Phys. Dep.,  Cochin Univ. Sci. Technol.,  Kerala,  India.    Liq. Cryst.  (1995),  18(1),  167-9
24. Monitoring the photobleaching of cresyl violet in polyvinyl alcohol using the photoacoustic effect.     Philip, Annieta; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.    Physics Department,  Cochin University Science and Technology,  Cochin,  India.    Opt. Eng. (Bellingham, Wash.)  (1994),  33(6),  1962-3. 
25. Temporal and spatial evolution of laser ablated plasma from YBa2Cu3O7.     Harilal, S. S.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Appl. Phys. Lett.  (1994),  64(25),  3377-9. 
26. Fiber optic sensor based on evanescent wave absorption.     Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Opt. Eng. (Bellingham, Wash.)  (1993),  032(04),  692-4. 
27. Measurement of laser ablation threshold on doped bismuth strontium calcium copper oxide high-temperature superconductors by the pulsed photothermal deflection technique.     Rajasree, K.; Vidyalal, V.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    J. Appl. Phys.  (1993),  74(3),  2004-7. 
28. Determination of the laser-induced damage threshold of bulk polymer samples at 1.06 mm using the pulsed photothermal deflection technique.     Rajasree, K.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Meas. Sci. Technol.  (1993),  4(5),  591-5. 
29. Pulsed photoacoustic technique for the measurement of laser damage threshold in bulk polymers.     Kumar, A. V. R.; Padmaja, G.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Kochi,  India.    Springer Ser. Opt. Sci.  (1992),  69(Photoacoust. Phototherm. Phenom. III),  489-91. 
30. Photoacoustic studies on multilayer dielectric coatings.     Philip, Annieta; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.    Phys. Dep.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    J. Phys. D:  Appl. Phys.  (1993),  26(5),  836-8. 
31. Spatial and temporal analysis of laser-induced plasma from a polymer sample.     Padmaja, G.; Kumar, A. V. Ravi; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    J. Phys. D:  Appl. Phys.  (1993),  26(1),  35-41. 
32. Interaction of carbendazim with Rhizobium on groundnut seed as measured by symbiotic relationship and disease response to Macrophomina phaseolina.     Radhakrishnan, P.; Chatrath, M. S.    Nucl. Res. Lab.,  Indian Agric. Res. Inst.,  New Delhi,  India.    Indian Phytopathol.  (1991),  44(2),  206-13. 
33. Damage threshold determination of bulk polymer samples using pulsed photothermal deflection technique.  Rajasree, K.; Ravikumar, A. V.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Bull. Mater. Sci.  (1992),  15(2),  183-8. 
34. Preparation of polypyrrole thin films by RF plasma polymerization.     Cherian, Ligy; Radhakrishnan, P..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Curr. Sci.  (1992),  62(5),  423-4. 
35. Evaluation of laser ablation threshold in polymer samples using pulsed photoacoustic technique.     Kumar, A. V. Ravi; Padmaja, G.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Pramana  (1991),  37(4),  345-51. 
36. Characteristics of laser-induced plasma from high-Tc superconductor.     Padmaja, G.; Kumar, A. V. Ravi; Vidyalal, V.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Bull. Mater. Sci.  (1991),  14(3),  545-9
37. A low-inductance, long-life, triggered spark gap switch for Blumlein-driven lasers.     Baby, Thomas; Ramachandran, T.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.    Dep. Phys.,  Cochin Univ. Sci. and Technol.,  Cochin,  India.    Meas. Sci. Technol.  (1991),  2(9),  873-5. 
38. Spectral features of laser induced plasma from yttrium barium copper oxide (YBa2Cu3O7) and gadolinium barium copper oxide (GdBa2Cu3O7) high Tc superconductors.     Padmaja, G.; Kumar, A. V. Ravi; Vidyalal, V.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Pramana  (1989),  32(5),  L693-L698. 
39. Time evolution of neodymium:YAG laser-induced plasma from gadolinium barium copper oxide (GdBa2Cu3O7) high-Tc superconductor.     Padmaja, G.; Kumar, A. V. Ravi; Vidyalal, V.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    J. Phys. D:  Appl. Phys.  (1989),  22(10),  1558-61. 
40. Laser-induced damage study of polycitral films.     Augustine, M. Sajimol; Radhakrishnan, P.; Jayalakshmi, S.; Pillai, M. G. Krishna.    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Bull. Electrochem.  (1988),  4(2),  177-8. 
41. Translocation and distribution of carbendazim in groundnut plants (Arachis hypogaea L.) following seed application.  Radhakrishnan, P.; Chatrath, M. S.    Nucl. Res. Lab.,  Indian Agric. Res. Inst.,  New Delhi,  India.    J. Nucl. Agric. Biol.  (1986), 15(3),  162-9. 
42. Alkali and gas emissions from PFB combustion of lignite.     Radhakrishnan, P.; Zakkay, V.; Agnone, A.    Antonio Ferri Lab.,  New York Univ.,  Westbury,  NY,  USA.    Combust. Sci. Technol.  (1986),  50(4-6),  271-81. 
43. Damage threshold studies of magnesium fluoride thin films deposited over polyacrilonitrile.     Radhakrishnan, P.; Sathianandan, K.    Phys. Dep.,  Cochin Univ.,  Cochin,  India.    Appl. Opt.  (1986),  25(7),  1027-8. 
44. Laser-induced damage to spray pyrolysis deposited transparent conducting films.     Radhakrishnan, P.; Sathianandan, K.; Subhash, N.    Phys. Dep.,  Cochin Univ.,  Cochin,  India.    J. Appl. Phys.  (1986),  59(3),  902-4. 
45. Laser-induced damage study of polyacrylonitrile films.     Radhakrishnan, P.; Sathianandan, K.; Vallabhan, C. P. G.    Cochin Coll.,  Cochin,  India.    Bull. Electrochem.  (1985),  1(3),  319-20. 

   Publications ( From Dec. 2001 )
46. 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.
47. Thermal characterization of doped InP using photoacoustic technique.  George, Sajan D.; Kurian, Achamma; Lase, Martin; Nampoori, V. P. N.; Vallabhan, C. P. G.  Proceedings of SPIE-The International Society for Optical Engineering (2001), 4595(Photonic Systems and Applications), 183-191. 
48. 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 
49. 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
50. 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.
51. 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. 
52. Photothermal deflection studies on GaAs epitaxial layers.  George N A, Vallabhan C P G, Nampoori V P N and Radhakrishnan P, Applied Optics
53. 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
54. 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
55. 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
56. Effect of Te doping on thermal diffusivity of Bi2Se3 crystals; A study using open cell photoacoustic technique. Sajan. D. George, Saji Augustine, Elizabeth Mathai, P. Radhakrishnan,V. P. N. Nampoori1 and C. P. G. Vallabhan, Physica Status Solidi (A) 
57. 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
58. 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.
59. 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.  
60. 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.
61. 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)
62. 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.
63. 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
64. 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.
65. 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
66. 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)
67. 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
68. 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)
69. 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
70. 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.
71. 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
72. 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.
73. 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.
74. 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.
75. 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).
76. 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).
77. 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.
78. 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
79. 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.
80. 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).
81. 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).
82. 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.
83. 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.
84. 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.
85. 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.
86. 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.
87. 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.
88. 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)
89. 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.
90. 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.
91. 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.
92. 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).
93. 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).
94. 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).
95.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).
96. 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).
97.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).
98. 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.
99.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.
100. 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.

  Recent Publications ( From JAN. 2008 )
101.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).
102. 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.
103.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.
104. 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.
105.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.
106. 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.
107.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.
108. 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.
109.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.
110. 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
111.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
112. 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
113.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
114. 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.
115.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.
116. 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.Radhakrishnan, Journal of photochemistry and Photobiology A: Chemistry 199(2008) 236-241
117.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.
118. 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.
119.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.
120. 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.
121.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.
122.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
123.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.
124. 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.
125.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) .
126. 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.
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