Gagan Kumar

Gagan Kumar

Position
Associate Professor
Location
Department of Physics, IIT Guwahati
Room No: A-201
Gagan Kumar is a member of the following research group and research areas:

Research group

Research areas

  • Terahertz Plasmonics and metamaterials, Guided Wave Devics, Ultrafast Spectroscopy.

Terahertz Photonics and Plasmonics lab, led by Dr. Gagan Kumar conduct research in plasmonics, metamaterials, guided wave devices, surface plasmon assisted enhanced Raman scattering and absorption etc. The research activities involve both theory and experiment with the aim to develop new devices and sensors with improved speed and sensitivity. In the ongoing projects, the primary research focus of the laboratory has been to demonstrate terahertz plasmonic devices using corrugated structures and explore near field coupling in terahertz metamaterials and sensors. Our research activities are currently supported by the Science and Engineering Research Board (SERB), Board of Research in Nuclear Sciences (BRNS)

Highlighted publications

  1. Journals

    • S.J.M. Rao, R. Sarkar, G. Kumar and D.R. Chowdhury"Gradual Cross polarization conversion of transmitted waves in near field coupled planar terahertz metamaterials", OSA Continuum vol.2, no.3, pp.603-614, [2019]

    • S.J.M. Rao, YK Srivastava, G. Kumar and D.R. Chowdhury"Modulating Fundamental Resonance in Capacitive Coupled Assymetric Terahertz Metamaterials", Scientific Reports vol.8, no.1, pp. 16773-1-16773-8, [2018]

    • S.J.M. Rao, G. Kumar, A.K. Azad and D.R. Chowdhury"Ultrafast Relaxation of Charge Carriers Induced Switching in Terahertz Metamaterials", Journal of Infrared, Millimeter and Terahertz Waves vol.39, no.12 , pp.1211-1220, [2018 ]

    • Koijam Monika Devi, Dibakar R. Chowdhury, Gagan Kumar and Amarendra K. Sarma"Dual-band electromagnetically induced transparency effect in a concentrically coupled terahertz metamaterial ", Journal of Applied Physics vol.124, no. , pp.063106-1-7, [2018 ]

    • Nipon Deka, Maidul Islam, Prashant K. Sarswat and Gagan Kumar"Enhancing solar cell efficiency with plasmonic behavior of double metal nanoparticle system Author links open overlay panel", Vacuum vol.152, no. , pp.285, [2018]

    • Koijam Monika Devi, M. Islam, Dibakar Roy Chowdhury, Amarendra K. Sarma and Gagan Kumar"Plasmon induced transparency in graphene based terahertz metamaterials", Europhysics Letters vol.120, no.2, pp.27005(p1)-27005(p6), [2018]

    • S. Jagan Mohan Rao, Deepak Kumar, Gagan Kumar and Dibakar Roy Chowdhury"Modulating the near field coupling through resonator displacement in planar terahertz metamaterials", Journal of Infrared, Millimeter and Terahertz Waves vol.38, no.1, pp.124-134, [2017]

    • Maidul Islam, Dibakar Roy Chowdhury, Amir Ahmad and Gagan Kumar"Planar plasmonic waveguide based terahertz sensor", Journal of Lightwave Technology vol.35, no. , pp.5215, [2017]

    • Maidul Islam, Dibakar Roy Chowdhury, Amir Ahmad and Gagan Kumar"Terahertz guided mode properties in an internally corrugated plasmonic waveguide", Journal of Applied Physics vol.122, no. , pp.53105, [2017]

    • Maidul Islam, S Jagan Mohan Rao, Gagan Kumar, Bishnu P Pal and Dibakar Roy Chowdhury"Role of Resonance modes on Terahertz Metamaterials based thin film sensors", Scientific Reports vol.7, no. , pp.7355, [2017]

    • Prashant K. Sarswat, Nipon Deka, S. Jagan Mohan Rao, Michael L. Free and Gagan Kumar"Surface Texture-Induced Enhancement of Optical and Photoelectrochemical Activity of Cu2ZnSnS4 Photocathodes", Journal of Electronics Materials vol.46, no.8, pp.5308-5318, [2017]

    • Koijam Monika Devi, Amarendra K. Sarma, Dibakar Roy Chowdhury and Gagan Kumar"Plasmon induced transparency through alternately coupled resonators in terahertz metamaterial", Optics Express vol.25, no.9, pp.10484-10493, [2017]

    Conferences

    • S. Jagan Mohan Rao, Maidul Islam, Gagan Kumar, Bishnu P Pal and Dibakar Roy Chowdhury"Single split gap resonator based terahertz metamaterials for refractive index sensing", Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XI, Jan. 27-Feb. 01 vol., no. , pp. 105311K-1-7 , [2018]

    • Maidul Islam, Dibakar Roy Chowdhury and Gagan Kumar"Planar Plasmonic Terahertz Waveguides for Sensor Applications", ICOLS 2018: 20th International Conference on Optics, Lasers and Spectroscopy vol., no. , pp. , [2018]

    • Deepak Kumar, S. Jagan Mohan Rao, Gagan Kumar and Dibakar Roy Chowdhury"Engineering the Resonances in Coupled Bilayer Terahertz Metamaterials", 4th International Conference on Nanoscience and Nanotechnology (ICONN-2017) vol., no. , pp. , [2017]

    • Koijam Monika Devi, Maidul Islam, Dibakar Roy Chowdhury, Amarendra K. Sarma and Gagan Kumar"Exploring plasmon induced transparency in graphene based terahertz metamaterials", IEEE Workshop on Recent Advances in Photonics vol., no. , pp. , [2017]

    • S Jagan Mohan Rao, Rakesh Sarkar, Divyam Khandelwal, Gagan Kumar and Dibakar Roy Chowdhury"Studying the near field capacitive coupling in planar terahertz metamaterial", IEEE Workshop on Recent Advances in Photonics vol., no. , pp. , [2017]

    • Maidul Islam, K M Dhriti, Dibakar Roy Chowdhury and Gagan Kumar"Thin film sensing in terahertz plasmonic waveguide", IEEE Workshop on Recent Advances in Photonics vol., no. , pp. , [2017]

    Link to all publications

Postdoctoral Fellow

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Current Research Scholar

KOIJAM MONIKA DEVI

S JAGAN M RAO

RAKESH SARKAR

KM DHRITI

ANGANA BHATTACHARYA


Completed Research Scholar

DR. MAIDUL ISLAM

Completed Postdoctoral Fellow

0 results