Dr. Soma Venugopal Rao

Assistant Professor

Department of Physics

Indian Institute of Technology Guwahati

Guwahati 781039

Assam, India

Phone: 0361-258-2718 (O)

0361-258-4718 (R)

e-mail: soma_venu@iitg.ernet.in

soma_venu@yahoo.com

http://www.iitg.ernet.in/physics/fac/soma_venu/

Professional and Educational Background

 

Ø     Thesis title: Studies of excited state dynamics, third-order nonlinearity, and nonlinear absorption in C60, porphyrins and phthalocyanines using incoherent laser spectroscopy.

 


NEW:  Advertisement for JRF position in DST sponsored project starting Feb./March 2007.

“Fabrication of micro- and nano-structures using femtosecond laser for photonics and micro fluidic applications,”

Position Now Closed !!!!!

 


Academic Interests

v     Femtosecond Laser Direct Writing

v     Nanophotonics and  Lab-on-a-chip

v     Polymer/Semiconductor Integrated Optics

v     Micro-/Nano-machining using high-energy proton beam

v     Femtosecond/Picosecond Lasers and Optical Parametric Oscillators/Amplifiers

v     2nd and 3rd order nonlinear optical properties of Organics, Semiconductors

v     Optical Limiting, Z-Scan, Degenerate Four Wave Mixing

v     Second Harmonic Generation (SHG) / Difference Frequency Generation (DFG) in organic materials and semiconductor waveguides

 


Teaching Master’s and Bachelor’s courses at IITG

 

1.                  PH102 (Electromagnetism, Tutorial)             Jan – April 2005

2.                  PH110 (B.Tech. Laboratory)                         Jan – April 2005

3.                  PH101 (Mechanics, Tutorial)             July - December 2005

4.                  PH511 (M.Sc. II Laboratory)             July - December 2005

5.                  PH411 (M.Sc. I Electronics Lab.)      July - December 2005

6.                  PH412 (M.Sc. I Laboratory, Physics)                  Jan - April 2006  

7.                  PH533 (Nonlinear Optics)                              Jan - April 2006

8.                  PH407 (Computer Programming in C)          July - December 2006

9.                  PH411 (MSc. Lab I, Electronics)       July - December 2006

 

10.              PH408  Numerical Methods & Comp. Phys.             Jan – April 2007 (Home Page)

11.              PH101 Physics I (B.Tech.) Tutor                        Jan – April 2007

12.              PH110 Physics Lab (B.Tech.) Instructor            Jan – April 2007

M.Sc. Projects Completed

 

1.       S. Chaitanya Kumar “Studies of Dye Doping in High Molecular Weight Polymers (PMMA) for applications in microlaser fabrication” January-April, 2006.

2.       Dhriti Sundar Ghosh “Nonlinear optical properties of Zn phthalocyanine and a free base phthalocyanine studied using a low power He-Ne laser” January-April, 2006.

3.       Praveen Kolla “Nonlinear Optical Studies of Phthalocyanine Derivatives for Applications in Optical Limiting and Optical Switching”, 2007 Jan-April.

4.       Ch. Vamsi Krishna “Theoretical and experimental studies of nonlinear absorption in phthalocyanines using cw and nsec excitation”, 2007 Jan-April.

 

Research Projects undertaken

 

  1. From Department of Science and Technology entitled, “Fabrication and Characterization of Dye-doped Polymer Waveguides and Solid State Micro-cavity Dye Lasers” Amount Rs. 9,00,000 (2006-2008) under Fast-track scheme. (No.: SR/FTP/PS-12/2005). 
  1. From Department of Science and Technology entitled, “Fabrication of micro- and nano-structures using femtosecond laser for photonics and micro fluidic applications,” Amount Rs. 22,65,600 (2007-2010)

(Co-Investigator: Prof. D. Narayana Rao, University of Hyderabad).

(No.: SR/S2/LOP-11/2005)

 


List of Journal Publications
 

1.      (NEW) S.J. Mathews, S. Chaitanya Kumar, L. Giribabu, S. Venugopal Rao, “Large third order optical nonlinearity and optical limiting in symmetric and unsymmetrical phthalocyanines studied using Z-scan,” Submitted to Optics Commun., 2007.

2.      (NEW) N. Venkatram, D. Narayana Rao, L. Giribabu, S. Venugopal Rao, “Nonlinear optical and optical limiting studies of alkoxy phthalocyanines in solutions studied at 532 nm with nanosecond pulse excitation”, Submitted to Applied Physics B, 2007.

3.      (NEW) S.J. Mathews, S. Chaitanya Kumar, L. Giribabu, S. Venugopal Rao, “Nonlinear optical and optical limiting properties of phthalocyanines in solution and thin films of PMMA at 633 nm studied using a cw laser,” Materials Letters, In Press 2007. (pdf file)

4.      (NEW) S. Venugopal Rao, A.A. Bettiol, K.C. Vishnubhatla, S.N.B. Bhaktha, D. Narayana Rao, F. Watt, “Fabrication and characterization of Microlasers in SU8 doped with Rhodamine B using high energy proton beam,” Appl. Phys. Lett. 90, 101115, 2007. (pdf file)  (Also listed in March 19 issue of Virtual Journal of Nanoscale Science and Technology, 15(11), 2007.)

5.       A.A. Bettiol, S. Venugopal Rao, and F. Watt, “Fabrication of buried, channel waveguides in Foturan glass using proton beam writing”, Appl. Phys. Lett. 88, 171106, 2006. (pdf file)

6.      A. A. Bettiol, E.J. Teo, C.N.B. Udalagama, S. Venugopal Rao, J. A. van Kan, P. Shao, F. Watt, “Integrating photonic and microfluidic structures on a device fabricated using proton beam writing,” Proc. of SPIE 6186, 61860F, 2006. (pdf file)

7.      A.A. Bettiol, S. Venugopal Rao, T.C. Sum, J.A. van Kan and F. Watt, “Fabrication of optical waveguides using proton beam writing,”  Journal of Crystal Growth 288, 209-212, 2006 (pdf file)

8.      T. C. Sum, A.A. Bettiol, J.A. van Kan, S. Venugopal Rao, F. Watt, K. Liu, and E.Y.B. Pun, “Direct imaging of the end-of-range and surface profiles of proton beam written erbium-doped waveguide amplifiers by atomic force microscopy,” Journal of Applied Physics, 98, 033533, 2005. (pdf file)

9.      T. C. Sum, A. A. Bettiol, K. Liu, R.M. Qin, E.Y.B. Pun, S. Venugopal Rao, J. A. van Kan, and F. Watt, “Proton beam writing of Erbium doped waveguide amplifiers”, Nuclear Instruments & Methods in Physics Research B 231, 394-399, 2005 (pdf file)

10.  A.A. Bettiol, T.C. Sum, F.C. Cheong, C.H. Sow, S. Venugopal Rao, J.A. van Kan, E.J. Teo, K. Ansarim, F. Watt “A progress review of proton beam writing applications in microphotonics”, Nuclear Instrum. & Methods in Phys. Research B 231, 364-371, 2005. (pdf file) One of the TOP-25 downloaded articles (Science Direct) in the period of April-June, 2005.

11.  D.N. Rao, P.P. Kiran, N.K.M. Naga Srinivas, S. Venugopal Rao, “Tetratolylporphyrins as optical limiters”, Special issue of Indian Society for Radiation and Photochemical Sciences bulletin, 16(3-4) 3-8, 2004.(Edited by A. Samanta) (pdf file)

12.  S. Venugopal Rao, K. Moutzouris, M. Ebrahimzadeh, “Nonlinear frequency conversion in semiconductor optical waveguides using birefringent, modal, & quasi-phase-matching techniques”, J. Opt. A: Pure & Applied Optics, 6, 569-584, 2004. (pdf file)

13.  T.C. Sum, A.A. Bettiol, S. Venugopal Rao, J.A. van Kan, A. Ramam, and F. Watt, “Proton beam writing of passive polymer optical waveguides”, in Micromachining Technology for Microoptics and Nanooptics II, E.G. Johnson and G.P. Nordin, Editors, Proc. SPIE 5347, 160-169, 2004. (pdf file)

14.  N.K.M. Naga Srinivas, S. Venugopal Rao, and D. Narayana Rao, “Saturable and reverse saturable absorption properties of Rhodamine B in methanol and water”, J. Opt. Soc. Am. B. 20(12), 2470-2479, 2003. (pdf file)

15.  K. Moutzouris, S. Venugopal Rao, M. Ebrahimzadeh, A. De Rossi, M. Calligaro, V. Ortiz, V. Berger, “Second harmonic generation through optimised modal phase matching in semiconductor waveguides”, Appl. Phys. Lett. 83(4), 620-623, 2003 (pdf file)

1.      K. Zeaiter, D.C. Hutchings, R.M. Gwilliam, K. Moutzouris, S. Venugopal Rao, and M. Ebrahimzadeh, “Quasi-phase matched second harmonic generation in GaAs/AlAs superlattice waveguide using ion-implantation induced intermixing”, Opt. Lett. 28(9), 911-913, 2003. (pdf file)

2.      V. Loyo-Maldonado, H.K. Lee, C.R. Stanley, S. Venugopal Rao, K. Moutzouris, M. Ebrahimzadeh, J.S. Aitchison, “Generation of ultra short electrical pulses in semiconductor waveguides”, IEEE Phot. Tech. Lett. 15(3), 428-430, 2003 (pdf file)

3.      S. Venugopal Rao, K. Moutzouris, M. Ebrahimzadeh, A. De Rossi, M. Calligaro, V. Ortiz, G. Ginitz, and V. Berger, “Influence of scattering and two-photon absorption on the optical loss in GaAs/Al2O3 nonlinear waveguides measured using femtosecond pulses”, IEEE J. Quant. Electron. 39(3), 478-486, 2003. (pdf file)

4.      S. Venugopal Rao, K. Moutzouris, M. Ebrahimzadeh, A. De Rossi, M. Calligaro, V. Ortiz, G. Ginitz, and V. Berger, “Measurements of optical loss in GaAs/Al2O3 nonlinear waveguides in the infrared using femtosecond scattering technique”, Opt. Commun.  213(4-6), 223-228, 2002. (pdf file)

5.      S. Venugopal Rao and D. Narayana Rao, “Excited state dynamics of phthalocyanines studied using degenerate four wave mixing with incoherent light (DFWM-IL),” Journal of Porphyrins and Phthalocyanines 6(3), 233-237, 2002. (pdf file)

6.      S. Venugopal Rao, N.K.M.N. Srinivas, and D. Narayana Rao, “Nonlinear absorption and excited state dynamics in Rhodamine B studied using Z-scan and degenerate four wave mixing techniques,” Chem. Phys. Lett., 361(5-6), 439-445, 2002. (pdf file)

7.      K. Moutzouris, S. Venugopal Rao, M. Ebrahimzadeh, A. De Rossi, V. Berger, M. Calligaro, V. Ortiz, “Efficient second harmonic generation in GaAs/AlGaAs waveguides using birefringent phase matching”, Opt. Lett. 26(22), 1785-1787, 2001. (pdf file)

8.      S. Venugopal Rao, N.K.M.N. Srinivas, L. Giribabu, B.G. Maiya, D. Narayana Rao, R. Philip, and G. Ravindra Kumar, “Excited state dynamics in tetratolylporphyrins studied using DFWM with incoherent light and ps pulses,” Optics Communications 192, 123-133, 2001. (pdf file)

9.      N.K.M.N. Srinivas, S. Venugopal Rao, and D. Narayana Rao, “Wavelength dependent studies of nonlinear absorption in ZnmpTBP using Z-scan,” Journal of Porphyrins and Phthalocyanines 5(7), 549-554, 2001. (pdf file)

10.  S. Venugopal Rao, N.K.M.N. Srinivas, L. Giribabu, B.G. Maiya, D. Narayana Rao, Reji Philip, and G. Ravindra Kumar, “Studies of third-order optical nonlinearity and nonlinear absorption in Tetra Tolyl Porphyrins using degenerate four wave mixing and Z-scan,” Optics Communications182, 255-264, 2000. (pdf file)

11.  D. Narayana Rao and S. Venugopal Rao, “Excited state enhancement of third-order optical nonlinearity in AuTTP studied by Degenerate Four Wave Mixing at 532 nm”, Asian Journal of Physics 9(2), 145-149, 2000. (pdf file)

12.  P. Gangopadhyay, S. Venugopal Rao, D. Narayana Rao and T.P. Radhakrishnan, “N-Alkyl-p-nitroanilines: Impact of alkyl chain length on crystal structures and optical SHG”, J. Mater. Chem. 9(8), 1699-1706, 1999. (pdf file)

13.  S. Venugopal Rao, D. Narayana Rao, J.A. Akkara, B.S. DeCristofano, and D.V.G.L.N. Rao, “Dispersion studies of nonlinear absorption in C60 using Z-scan,” Chem. Phys. Lett. 297, 491-498, 1998. (pdf file)

14.  D. Narayana Rao, S. Venugopal Rao, E.  Blanco, F.J. Aranda, D.V.G.L.N. Rao, and Joseph A. Akkara, “A comparative study of C60, phthalocyanine and a porphyrin for optical limiting over the visible region,” J. Sci. Ind. Res. (Special issue on frontiers in bio-technology) 57(10,11), 664-667, 1998. (pdf file)

15.  S. Venugopal Rao and D. Narayana Rao, “Excited state dynamics of C60 studied using incoherent light,” Chem. Phys. Lett. 283(3-4), 227-230, 1998. (pdf file)

16.  D. Narayana Rao, S. Venugopal Rao, F.J. Aranda, M. Nakashima, J.A. Akkara, “Ultra-fast relaxation times of metalloporphyrins by time resolved degenerate four wave mixing with incoherent light,” J. Opt. Soc. Am. B14(10), 2710-2714, 1997. (pdf file)

17.  S. Venugopal Rao, L. Giribabu, B.G. Maiya and D. Narayana Rao, “A novel observation in the measurement of ultrafast relaxation times using incoherent light,” Current Science 72(12), 957-960, 1997. (pdf file)

 

BOOK Chapter(s) / Invited Talks

1.      “Theoretical and experimental study of the excited state dynamics in reverse saturable absorbers using Z-scan technique,” S. Venugopal Rao, S. Singh, B.S. DeCristofano and D. Narayana Rao, in Optics and Optoelectronics: Theory, devices, and applications, Volume 1, Edited by O.P. Nijhawan, A.K. Gupta, A.K. Musla, Kehar Singh, Narosa Publishing House, New Delhi, (Proceedings of International Conference on Optics and Lasers, Dehradun, India), 167-172, December 1998. (pdf file)

2.      S. Venugopal Rao, “Proton beam writing and its applications in photonics,” INVITED TALK at NANO-05, Indo-German workshop on “Synthesis and Modification of Nano-Structured Materials by Energetic Ion Beams,” Nuclear Science Centre, New Delhi, February 20-24, 2005.

3.      S. Venugopal Rao, “Nonlinear optical properties and applications of organic materials and polymers,” Invited one hour lecture at QIP short term course on "Semiconducting organics as future generation electro-optical materials" at IIT Guwahati, June 20-24, 2005.

4.      S. Venugopal Rao, “Femtosecond laser micromachining/direct writing,” INVITED LECTURES at SERC School on Ultrafast studies held at University of Hyderabad, Hyderabad, July 10-29, 2006

5.      S. Venugopal Rao, A.A. Bettiol, and F. Watt, “Fabrication of micro-photonic components in SU8 and PMMA using proton beam writing,” Invited Talk at Photonics 2006, University of Hyderabad, Hyderabad, December 13-16, 2006.

Presentations in International Conferences/Symposia
 

1.      S. Venugopal Rao, A.A. Bettiol, F. Watt, “Fabrication and characterization of trapezoidal shaped microcavity lasers and channel waveguides in doped SU8 using high energy proton beam,” Submitted to CLEO Pacific-Rim 2007.

2.      N. Venkatram, S.J. Mathews, S. Chaitanya Kumar, L. Giribabu, S. Venugopal Rao, D. Narayana Rao, “Nonlinear optical studies of phthalocyanines in solutions and thin films of PMMA studied using cw and nanosecond pulse excitation,” Proc. Photonics 2006, University of Hyderabad, Hyderabad, December 13-16, 2006.

3.      K.C. Vishnubhatla, S. Venugopal Rao, D. Narayana Rao, “Femtosecond laser direct writing of waveguides and microstructures in silicate and Foturan glasses,” Proc. Photonics 2006, University of Hyderabad, Hyderabad, December 13-16, 2006. (Mail me for copy of the full paper)

4.      S. Venugopal Rao, A.A. Bettiol, J.A. van Kan, and F. Watt, “Proton beam writing of buried, channel waveguides in Foturan glass,” Proc. ICOL 2005, PPFIO-20, Dehradun, India. (Poster Presentation) (pdf file)

5.      A.A. Bettiol, S. Venugopal Rao, T.C. Sum, J. van Kan, F. Watt, “Fabrication of Optical Waveguides using Proton Beam Writing,” MB-5-OR36, International Conference on Materials for Advanced Technologies, 3-8 July, Singapore, 2005.

6.      S. Venugopal Rao, A.A. Bettiol, J.A. van Kan, F. Watt, “Fabrication of micro- and nano-photonic structures in dye-doped polymers and nonlinear optical crystals using high energy proton beam,” INTP16, Proc. Photonics 2004, Cochin, December 9-11, 2004 (pdf file)

7.      T. C. Sum, A. A. Bettiol, K. Liu, R.M. Qin, E.Y.B. Pun, S. Venugopal Rao, J. A. van Kan, and F. Watt, “Proton beam writing of Erbium doped waveguide amplifiers,” International Conference on Nuclear Microprobe Technology and Applications, Sept. 13-17, 2004. (ORAL)

8.      A.A. Bettiol, C.H. Sow, T.C. Sum, S. Venugopal Rao, J.A. van Kan, E.J. Teo, K. Ansari and F. Watt, “Proton beam writing applications in microphotonics”, International Conference on Nuclear Microprobe Technology and Applications, Sept. 13-17, 2004. (ORAL)

9.      S. Venugopal Rao, T.C. Sum, A.A. Bettiol, J.A. van Kan, and F. Watt, “Optical Characterization of Waveguides Fabricated in PMMA, SU8, and Phosphate Glass Using High Energy Proton Beam,” First International Workshop on Proton Beam Writing, July 18-22, National University of Singapore, Singapore, 2004. (ORAL) (pdf file)

10.  A.A. Bettiol, C.H. Sow, T.C. Sum, S. Venugopal Rao, J.A. van Kan, and F. Watt, “Novel applications in polymer based micro and nano photonics using proton beam writing,” First International Workshop on Proton Beam Writing, July 18-22, National University of Singapore, Singapore, 2004. (ORAL)

11.  T.C. Sum, A.A. Bettiol, S. Venugopal Rao, J.A. van Kan, and F. Watt, “Optical waveguide fabrication using proton beam writing,” First International Workshop on Proton Beam Writing, July 18-22, National University of Singapore, Singapore, 2004. (ORAL)

12.  K. Zeaiter, D. Hutchings, R.M. Gwilliam, K. Moutzouris, S. Venugopal Rao, and M. Ebrahimzadeh, “First-order quasi-phase-matched second harmonic generation in GaAs/AlAs superlattice waveguides by use of ion-Implantation induced intermixing,” CE5-5, CLEO Europe 2003, Munich. (ORAL presentation)

13.  S. Venugopal Rao, K. Moutzouris, M. Ebrahimzadeh, A. De Rossi, M. Calligaro, V. Ortiz, and V. Berger,  “Second harmonic generation in GaAs/AlGaAs waveguides with femtosecond pulses near 1.55 mm using modal phase matching technique,” CE1-3, CLEO Europe 2003, Munich. (ORAL presentation)

14.  K. Moutzouris, S. Venugopal Rao, M. Ebrahimzadeh, R.M. Gwilliam, K. Zeaiter, and D. Hutchings, “Second harmonic generation in first-order quasi-phase-matched GaAs/AlAs superlattice waveguides by use of ion implantation induced intermixing,” CThU4, Proc. CLEO 2003, Baltimore, USA. (ORAL presentation) Trends in Optics and Photonics, 88, 2003. (pdf file)

15.  S. Venugopal Rao, K. Moutzouris, M. Ebrahimzadeh, A. De Rossi, M. Calligaro, V. Ortiz, and V. Berger, “Modal phase matching in GaAs/AlGaAs waveguides: second harmonic generation with femtosecond pulses near 1.5 mm,” CTuG1, Proc. CLEO 2003, Baltimore, USA. (ORAL presentation) Trends in Optics and Photonics, 88, 505-506, 2003.  (pdf file)

16.  S. Venugopal Rao, K. Moutzouris, M. Ebrahimzadeh, A. De Rossi, M. Calligaro, V. Ortiz, G. Ginitz, and V. Berger, “Measurements of optical loss in GaAs/Al2O3 nonlinear waveguides in the infrared using femtosecond scattering technique: The role of two-photon absorption”, Scottish Summer School in Physics (SUSSP 56) on Ultrafast Photonics, University of St. Andrews, September 01-14, 2002, St. Andrews, UK.

17.  K. Zeaiter, D. Hutchings, K. Moutzouris, S. Venugopal Rao, and M. Ebrahimzadeh, “Quasi-phase-matched second harmonic generation in an GaAs/AlAs superlattice waveguide using ion-implantation induced intermixing”, Proc. of LEOS, MJ4, pp. 81-82, Glasgow, 2002.

18.  V. Loyo-Maldonado, J.S. Aitchison, S. Venugopal Rao, K. Moutzouris, and M. Ebrahimzadeh, “Generation of ultra short electrical pulses in semiconductor waveguides”, Trends in Optics and Photonics, 73, 256-257, 2002 [CLEO, Long Beach, California May 19-24, USA]. (pdf file)

19.  K. Moutzouris, S. Venugopal Rao, M. Ebrahimzadeh, A. De Rossi, M. Calligaro, V. Ortiz, G. Ginitz, and V. Berger, “Measurements of optical loss in GaAs/Al2O3 nonlinear waveguides in the infrared using femtosecond scattering technique”, Trends in Optics and Photonics, 73, 317-318, 2002 [CLEO, Long Beach, California May 19-24, USA]. (pdf file)

20.  S. Venugopal Rao, K. Moutzouris, M. Ebrahimzadeh, A. De Rossi, V. Berger, M. Calligaro and V. Ortiz, “Efficient second harmonic generation in birefringently phase-matched GaAs/Al2O3 waveguides using femtosecond pulses at 2.01 mm”, Trends in Optics and Photonics, 73, 255-256, 2002 [CLEO, Long Beach, California May 19-24, USA] (ORAL presentation). (pdf file)

21.  S. Venugopal Rao, K. Moutzouris, C.T.A. Brown, M. Ebrahimzadeh, A. De Rossi, V. Berger, M. Calligaro and V. Ortiz, “Efficient second harmonic generation in GaAs/AlGaAs waveguides using birefringent phase matching”, QEP-15 Tech. digest, pp. 57, Glasgow, September 03-06, 2001.

22.  S. Venugopal Rao, N.K.M.N. Srinivas, L. Giribabu, B.G. Maiya, R. Philip, G.R. Kumar, and D. Narayana Rao, “Studies of third-order optical nonlinearity, excited state dynamics, and nonlinear absorption in Tetratolyl Porphyrins using DFWM and Z-scan with incoherent light and ps pulses,” International Conference on Nonlinear Optics, Davos, Switzerland, March 2000. (pdf file)

23.  S. Venugopal Rao, Suneel Singh, B.S. DeCristofano and D. Narayana Rao, “Theoretical and experimental study of the excited state dynamics in reverse saturable absorbers using Z-scan technique,” Proceedings of International Conference on Optics and Lasers, 167-172, Dehradun, India, December 1998. (pdf file)

24.  D. Narayana Rao and S. Venugopal Rao, “Excited state enhancement of third-order optical nonlinearity in AuTTP studied by degenerate four wave mixing at 532 nm”, International Conference on Lasers and Applications, St. Joseph’s College, Tiruvananthapuram, India, March 1-4, 2000.  Appeared in Asian Journal of Physics, 9(2), 145-149, 2000.

25.  D. Narayana Rao, S. Venugopal Rao, F.J. Aranda, D.V.G.L.N. Rao, M. Nakashima, J.A. Akkara, “Ultrafast relaxation times of metalloporphyrins by time resolved degenerate four wave mixing with incoherent light,” Fourth International Conference on Frontiers in Polymers and Advanced Materials, Cairo, Egypt, January 4 - 9, 1997.

26.  D. Narayana Rao, S. Venugopal Rao, Ram Mohan, J.A. Akkara, “Optical response of bacteriorhodopsin by picosecond time resolved four wave mixing studies using a nanosecond laser,” International Conference on Frontiers in Biotechnology, Trivandrum, India, November 26 - 29, 1997.

27.  S. Venugopal Rao, “Femtosecond transient kinetics of Zn-Tetrabenzporphyrin using incoherent laser spectroscopy,” International Conference on Spectroscopy - Perspectives and Frontiers, p 182, January 3- 5, 1996, BARC, Bombay, India.

 

Presentations in National Conferences/Symposia

 

  1. N. Venkatram, S. Venugopal Rao, L. Giribabu, D. Narayana Rao, “Nonlinear absorption studies of a Zinc Phthalocyanine,” National Symposium on Spectroscopy and Applications, Indian Association of Cultivation Sciences, January 18-20, 2006.

2.      S. Venugopal Rao, N.K.M. Naga Srinivas, and D. Narayana Rao, “Wavelength dependent studies of nonlinear absorption in ZnmpTBP using Z-scan with a ns OPO”, XXVI National Symposium on Optics and Opto-electronics, REC, Warangal, India, Feb 4-6, 2000.

3.      P. Gangopadhyay, S. Venugopal Rao, D. Narayana Rao, and T.P. Radhakrishnan, “Alkyl chain length as a design element in molecular materials for optical second harmonic generation”, Proc. of National Laser Symposium, Pg. 143, University of Hyderabad, India, December 15-17, 1999.

4.      S. Venugopal Rao, N.K.M.N. Srinivas, L. Giribabu, B.G. Maiya, R. Philip, G.R. Kumar, and D. Narayana Rao, “Studies of third-order optical nonlinearity and nonlinear absorption in Tetra Tolyl Porphyrins using degenerate four wave mixing and Z-scan”, Proc. of the National Laser Symposium, Pg. 163, University of Hyderabad, Hyderabad, India, December 15-17, 1999.

5.      S. Venugopal Rao, N.K.M.N. Srinivas, L. Giribabu, B.G. Maiya, R. Philip, G.R. Kumar, and D. Narayana Rao, “Excited state dynamics in Tetratolyl Porphyrins studied using DFWM with incoherent light and 35 ps pulses,” Proc. of National Laser Symposium, Pg. 165, University of Hyderabad, India, December 15-17, 1999.

6.      S. Venugopal Rao, Suneel Singh and D. Narayana Rao, “Wavelength dependence of nonlinear absorption in copper phthalocyanine using Z-scan,” Proc. of National Laser Symposium, 171-172, IIT Kanpur, India, December 1998.

7.      S. Venugopal Rao, Suneel Singh and D. Narayana Rao, “Dispersion studies of nonlinear absorption in zinc tetrabenzporphyrin (ZnmpTBP) using Z-scan”, Proc. of National Laser Symposium, 169-170, IIT Kanpur, India, December 1998.

8.      S. Venugopal Rao, Suneel Singh and D. Narayana Rao, “Theoretical model for the measurement of ultrafast relaxation times in organic materials using incoherent light”, Seminar on selected topics in theoretical physics, September 15-17, 1998, University of Hyderabad, Hyderabad, India.

9.      M. Ravi, S. Venugopal Rao, V. Nirmal Kumar, and T.P. Radhakrishnan, “Quinonoid molecular materials for Nonlinear optics-EFISHG study of molecular hyperpolarizabilities”, Page No.P1-33 Proc. of the “Symposium on current topics in Physics of Materials,” University of Hyderabad, Hyderabad, India, March 27-29, 1997

10.  M. Ravi, S. Venugopal Rao, P. Gangopadhyay, T.P. Radhakrishnan, “Electric field induced second harmonic generation study of novel quinonoid molecules,” Proc. of National Laser Symposium, 187, Physical Research Laboratory, Ahmedabad, India, December, 1997

11.  S. Venugopal Rao, Suneel Singh, D. Narayana Rao, “Excited state dynamics of C60 studied using DFWM – IL,” Proc. of National Laser Symposium, 133-134, Physical Research Laboratory, Ahmedabad, India, December, 1997

12.  S. Venugopal Rao, Suneel Singh, D. Narayana Rao, “A theoretical model for the measurement of ultrafast population relaxation times in organic molecules using incoherent light,” Proc. of National Laser Symposium, 139-140, Physical Research Laboratory, Ahmedabad, India, December, 1997

13.   S. Venugopal Rao, “The study of ultrafast relaxation times using DFWM-IL,” 30 min. talk presented at SERC School on “Nonlinear Optics and Laser Spectroscopy” held at IIT Delhi, India, March 10-27, 1997.

14.  S. Venugopal Rao and D. Narayana Rao, “Nonlinear Optical properties of Indian Ink,” Proceedings of National Laser Symposium, CAT, Indore, India, February 6-8, 217, 1996.

 

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