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Kamaraju Natarajan

Kamaraju Natarajan

Position
Associate Professor
Location
Department of Physical Sciences, IISER Kolkata
Room No: TRC-121

Research group

Research areas

  • Ultrafast photo-excitation and the subsequent carrier dynamics in various nano and bulk insulating materials (Ultrafast multi-species kinetics models and investigations in various condensed matter systems), Accurate thickness extraction algorithms for THz spectroscopy, THz spectroscopy of disordered materials, Ultrafast and THz Coherent quasi particle dynamics (Coherent acoustic and optical Phonons, magnons and other quasi particle excitations) in various condensed matter systems. Another direction of our interest is on terahertz medical imaging and spectroscopy, and in developing methods and components for terahertz imaging and terahertz spectroscopy, also discovering new techniques to better characterize quantum materials using ultrashort femtosecond pulses.

We are interested in ultrafast dynamics in condensed matter systems using femtosecond pump-probe spectroscopy and time and frequency resolved terahertz (THz) spectroscopy. The pump and probe pulses range from UV, VIS, IR and THz wavelengths. Nonlinear response of the condensed matter will be investigated using femtosecond pulses in this electromagnetic region. Some examples of excellent candidates to use THz and femtosecond pulses are 2D systems like 2DEG/2DHG, 2D layered materials, topological systems, solar cells, strongly correlated systems and artificially created metamaterials. Thus, we are interested in developing various tools using femtosecond lasers to probe condensed matter world. Some of the tools that will be used in our investigations are Pump-Probe spectroscopy, THz spectroscopy, Nonlinear Spectroscopy (Second Harmonic Generation). Another direction of my interest is to study possible damage to biological systems due to intense THz pulses and THz imaging of biological systems and superconductors.

  • PhD (Physics), IISc, Bangalore.
  • MSc (Physics), Sri Sathya Sai Institute of Higher Learn (Sri Sathya Sai University (Deemed)).
  • BSc(Hons.) (Physics), Sri Sathya Sai Institute of Higher Learn (Sri Sathya Sai University (Deemed)).
  • Associate Professor, DPS, IISER Kolkata (Current)
  • Assistant Professor , DPS, IISER Kolkata (2016-2021)
  • Postdoctoral Research Scientist , Los Alamos National Laboratory, Los Alamos, NM, USA (2013-2016)
  • Postdoc Research Associate , Rensselaer Polytechnic Institute, Troy, USA (2012 - 2013)
  • Post doctoral fellow, Fritz Haber Max Planck Gelleshaft, Berlin, Germany (2010 - 2012)
  • Outstanding Reviewer 2018 by Nature: Light Science Applications (2019)
  • Max-Planck Society Fellowship for Postdoctoral Researchers scholarship by Max-Planck Society, Germany (2010-2012)
  1. NM, Anjan; Mukherjee, Soumya; Ramesh, Saranya; Mondal, Ayan; Mahalingam, Venkataramanan and Natarajan, Kamaraju. 2022."Photo Excited Ultrafast Dynamics of Free Carriers and Polarons in V2O5 Micro-Particles through Time-resolved Non-Degenerate Pump Probe Spectroscopy." J. Phys. Chem. C, 126, 20535
  2. NM, Anjankumar; Mukherjee, Soumya; Sunny, Anoop; Karthikeyan, B and Kamaraju, N. 2022."Investigation of self-trapped excitonic dynamics in hematite nanoforms through non-degenerate pump–probe transmission spectroscopy." Applied Physics Letters, 121, 202102
  3. Mukherjee, Soumya; Anjan Kumar, N. M; Upadhya, Prashanth and Kamaraju, N.. 2021."A review on numerical methods for thickness determination in terahertz time-domain spectroscopy." Eur. Phys. J. Spec. Top, 230, 107-120
  4. Sarkar, Jit; Menon, Shankar G; Prasad, Neena; Karthikeyan, B and Kamaraju, N.. 2019."Ultrafast Carrier Dynamics of Undoped and Ho3+ Doped ?-Bismuth Oxide Micro-Rods." J. Phys. Chem. C, 123, 10007
  5. Sarkar, Jit; Menon, Shankar G; Madhumitha, C; Karthikeyan, B and Kamaraju, N.. 2018."Ultrafast electron hole plasma dynamics in chemically pristine and Ag-doped ZnO nanorods." Journal of Applied Physics, 124, 243103
  6. Y. Yang, N. Kamaraju, S. Campione, S. Liu, J L. Reno, M B. Sinclair, R P. Prasankumar, and I. Brener, Transient GaAs Plasmonic Metasurfaces at Terahertz Frequencies “, ACS Photonics 4 15-21 (2017).
  7. N. Kamaraju, Andrea Rubano, Linke Jian, Surajit Saha, T. Venkatesan, Jan Nötzold, R. Kramer Campen, Martin Wolf, Tobias Kampfrath, “Sub-cycle control of terahertz waveform polarization using all-optically induced transient metamaterials”, Nature Light Science and Applications, 3, e155 (2014).
  8. Moumita Dutta, N. Kamaraju, Soutik Betal, Rohit P. Prasankumar, Amar S. Bhallaa and Ruyan Guo, "Magnetoelastoelectric coupling in core–shell nanoparticles enabling directional and mode-selective magnetic control of THz beam propagation”, Nanoscale 9, 13052 (2017).
  9. N. Kamaraju, Sunil Kumar, M. Anija and A. K. Sood, “Large-amplitude chirped coherent phonons in tellurium mediated by ultrafast photo excited carrier diffusion", Phys. Rev. B 82, 195202(2010).
  10. N. Kamaraju, Sunil Kumar, S. Krishnamurthy, S. Guha, A. K. Sood, C. N. R. Rao, “Large nonlinear absorption and refraction coefficients of carbon nanotubes estimated from femtosecond Z-scan measurements”,Applied Physics Letters 91, 251103 (2007).
SL NO Grant Title Sponsoring Agency Project Period
1 Development of Fast Scan Ultrafast and ultra-broad band THz Spectroscopy CRG, DST SERB March 2022-March 2025
  • DPS Outreach Faculty In-Charge (May 2017-May 2020)
  • Member of Purchase Committee (Dec, 2022-Current)
  • UGAC member (2016-Current)
  • DPS Safety Committee (Nov 2022-)
  • DPS website (2021-)
  • Visitors Hostel Faculty In-Charge Team (from July 2016)
  • Liquid Nitrogen Faculty In-Charge (June 2018-Nov 2023),
  • DPS Colloquium (May 2021-May 2022)
  • JEST 2022 Committee (as Co-Convener)
  • Children Park Committee to establish Children Park in the campus