Faculty Details

Areas of Interest

• Ultrafast meets ultrasmall: We employ femto- and atto-second light pulses capture the dynamics in nano-scale systems
• We explore nanoscale superfluidics with He nanodroplets
• We innovate in next-gen photolithography, especially EUV and x-ray sources

Current Research

Students

Current PhD Students

• PH15D025    ANUBHAB SAHOO
• PH17D006    PRITHA DEY
• PH18D204    KESHAV SISHODIA
• PH19D037    SUBHENDU DE
• PH20D047    AYAN KUMAR NAI
• PH20D054    RAVINDRA KUMAR NITHARWAL
• PH20D102    JHANSI RANI M
• PH21D019    AASHISH PANWAR
• PH21D023    NAVEEN KUMAR
• PH18D027    DINESH KUMAR S (Co-Guidance)

Recent Publications

• The role of defects in the nonlinear optical absorption behavior of carbon and ZnO nanostructures. Benoy Anand, SR Krishnan, Ramakrishna Podila, S Siva Sankara Sai, Apparao M Rao, Reji Philip. Physical Chemistry Chemical Physics. 16 . 8168 . 2014.
• Photoionization of clusters in intense few-cycle near-infrared femtosecond pulses. S R Krishnan, Ram Gopal, Rajeev Rajendran, Jagannath Jha, Vandana Sharma, Marcel Mudrich, Robert Moshammer, Krishnamurthy Manchikanti. Physical Chemistry Chemical Physics. 16 . 8721 . 2014.
• Charge transfer and Penning ionization of dopants in or on helium nanodroplets exposed to EUV radiation. D Buchta, S R Krishnan, N B Brauer, M Drabbels, P O'Keeffe, M Devetta, M DiFraia, C Callegari, R Richter, M Coreno, K Prince, F Stienkemeier, R Moshammer, M Mudrich. Journal of Physical Chemistry A. 117 . 4394 . 2013.
• Extreme ultraviolet ionization of pure He nanodroplets: Mass-correlated photoelectron imaging, Penning ionization, and electron energy-loss spectra. D Buchta, S R Krishnan, NB Brauer, M Drabbels, P O’Keeffe, M Devetta, M Di Fraia, C Callegari, R Richter, M Coreno, K C Prince, F Stienkemeier, J Ullrich, R Moshammer, M Mudrich. The Journal of Chemical physics. 139 . 084301 . 2013.
• Optical diode action from axially asymmetric nonlinearity in an all-carbon solid-state device. Benoy Anand, Ramakrishna Podila, Kiran Lingam, Siva Rama Krishnan, S Siva Sankara Sai, Reji Philip, Apparao M Rao. Nano letters. 13 . 5771 . 2013.
• Ignition of doped helium nanodroplets in intense few-cycle laser pulses (refereed book chapter). S. R. Krishnan, L. Fechner, M. Kremer, V. Sharma, B. Fischer, N. Camus, J. Jha, M. Krishnamurthy, T. Pfeifer, R. Moshammer, J. Ullrich, F. Stienkemeier and M. Mudrich. Springer Proceedings in Physics. 125 . 385 . 2012.
• Evolution of dopant-induced helium nanoplasmas. S R Krishnan, Ch Peltz, L Fechner, V Sharma, M Kremer, B Fischer, N Camus, T Pfeifer, J Jha, M Krishnamurthy, CD Schröter, J Ullrich, F Stienkemeier, R Moshammer, Th. Fennel, M Mudrich. New Journal of Physics. 14 . 075016 . 2012.
• Dopant-induced ignition of helium nanodroplets in intense few-cycle laser pulses. S. R. Krishnan, L Fechner, M Kremer, V Sharma, B Fischer, N Camus, J Jha, M Krishnamurthy, T Pfeifer, R Moshammer, J Ullrich, F Stienkemeier, M Mudrich, A Mikaberidze, U Saalmann, J. -M. Rost. Physical Review Letters. 107 . 173402 . 2011.
• Filamentation without intensity clamping. P Prem Kiran, Suman Bagchi, Cord L Arnold, Siva Rama Krishnan*, G Ravindra Kumar, Arnaud Couairon. Optics Express. 18 . 21504 . 2010.
• Supercontinuum emission from tightly focused femtosecond pulses in air: beyond intensity clamping. P Prem Kiran, Suman Bagchi, Siva Rama Krishnan, C L Arnold, G Ravindra Kumar, A Couairon. Proc. SPIE Nonlinear Optics and Applications IV. 7728 . 77281P . 2010.
• Focal dynamics of multiple filaments: Microscopic imaging and reconstruction. P Prem Kiran, Suman Bagchi, Siva Rama Krishnan, C L Arnold, G Ravindra Kumar, Arnaud Couairon. Physical Review A. 82 . 013805 . 2010.
• Optical limiting properties of CdS nanowires. V Sai Muthukumar, J Reppert, CS Sandeep, S Krishnan, R Podila, Narayanan Kuthirummal, S Sai, K Venkataramaniah, R Philip, AM Rao. Optics Communications. 283 . 4104 . 2010.
• Focusing of ultrashort sub-TW laser pulses in air: supercontinuum emission. S Bagchi, C L Arnold, S Rama Krishnan, G Ravindra Kumar, A Couairon. Proc. SPIE. 8173 . 81730Q . 2010.
• Microwave-assisted solid-state grafting of multi-walled carbon nanotubes on polyurethane for the synthesis of a composite with optical limiting properties. Yuhong Chen, V. Sai Muthukumar, Yubing Wang, Cheng Li, S. Sivarama Krishnan, S. Siva Sankara Sai, K. Venkataramaniah, S. Mitra. Journal of Materials Chemistry. 19 . 6568 . 2009.
• Lorentzian metric induced from a background Riemannian metric. V V Reddy, R Sharma, S Sivaramakrishnan. Int. J. Pure Appl. Math.. 47 . 3. 2008.
• Nonlinear optical transmission of surface-modified nickel sulphide nanoparticles: Saturation of absorption and optical limiting. V. Sai Muthukumar, J K Kiran, J Reppert, R Satyajit, Vamsi Krishna, G Nageshwar Rao, S Siva Rama Krishnan, S Siva Sankara Sai, K Venkataramaniah, A M Rao. Nano. 3 . 161 . 2008.
• Pramana – J. Phys vol. 68, pg. 547, 2007: “Systematic study of spatio-temporal dynamics of intense femtosecond laser pulses in BK-7 glass. Ram Gopal, V. Deepak and *Siva Rama Krishnan. Pramana - Journal of Physics. 68 . 547. 2007.
• Systematic study of spatio-temporal dynamics of intense femtosecond laser pulses in BK-7 glass. Ram Gopal, V. Deepak and *Siva Rama Krishnan. Pramana – J. Phys. 68 . 547. 2007.
• Spacetimes through Hawking–Ellis construction with a background Riemannian metric. V. V. Reddy, R. Sharma and S. Sivaramakrishnan. Classical and Quantum Gravity. 24 . 3339 . 2007.
• Nonlinear optical scattering and absorption in bismuth nanorod suspensions. S Sivaramakrishnan, VS Muthukumar, S Sivasankara Sai, K Venkataramaniah, Jason Reppert, Apparao M Rao, M Anija, Reji Philip, Narayanan Kuthirummal. Applied Physics Letters. 91 . 9 . 2007.
• All-optical spatial filtering with power limiting materials. C. S. Yelleswarapu, P. Wu, S. –R. Kothapalli, D. V. G. L. N. Rao, B. R. Kimball, S. S. Sai, R. Gowrishankar, and S. Sivaramakrishnan. Optics Express. 14 . 1452 . 2006.

Teaching

• 2017 :  (Jan - May) - EP3190 Engineering Physics Lab II / PH2080 Physics Lab IV / PH5230 Seminar / PH5890 Ultrafast lasers and Applications; (Jul - Nov) - EP2090 Engineering Physics Lab I / PH2050 Physics Lab III / PH3500 Classical Physics
• 2018 :  (Jul - Nov) - PH5410 Atomic and Molecular Physics
• 2019 :  (Jan - May) - PH5120 Physics Lab II (PG) / PH7090 Foundations in Experiemntal Physics; (Jul - Nov) - PH5410 Atomic and Molecular Physics
• 2020 :  (Jan - May) - PH1020 Physics II
• 2021 :  (Jan - May) - PH1030 Physics Laboratory I / PH5890 Ultrafast lasers and Applications ; (Jul - Nov) - PH5410 Atomic and Molecular Physics / PH5890 Ultrafast lasers and Applications
• 2022 :  (Jan - May) - EP3100 Atomic & Molecular Spectroscopy / PH1030 Physics Laboratory I ; (Jul - Nov) - PH4999 Undergraduate Research Project / PH5814 Laser Physics and Applications
• 2023 :  (Jan - May) - EP3100 Atomic & Molecular Spectroscopy / EP3190 Engineering Physics Lab II