Associate Professor
Office Address: A-201, 0361-2583557
Email: gk@iitg.ac.in
http://www.iitg.ac.in/gk/

Journals

  • Rakesh Sarkar, Koijam Monika Devi, Dipa Ghindani, Ravikumar Jain, Arnab Pattanayak, S. S. Prabhu, Dibakar Roy Chowdhury and ,Gagan Kumar"Polarization independent dual-band electromagnetically induced transparency effect in terahertz metamaterials", Journal of Optics vol.22, no., pp.35105, [2020]

  • Rakesh Sarkar, D. Ghindani, K.M Devi, SS Prabhu, A. Ahmad and Gagan Kumar"Independently tunable electromagnetically induced transparency effect and dispersion in a multi-band terahertz metamaterial", Scientific Reports vol.9, no.1, pp.1-010, [2020]

  • 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]

  • A. Bhattacharya, K.M Devi, T Nguyen and Gagan Kumar"Actively tunable toroidal excitations in graphene based terahertz metamaterials", Optics Communication vol., no., pp.124919, [2019]

  • Koijam Monika Devi, Gagan Kumar and Amarendra K. Sarma"Surface polaritonic solitons and breathers in a planar plasmonic waveguide structure via electromagnetically induced transparency", Journal of the Optical Society of America B vol.36, no.-, pp.2160-2166, [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]

  • Jagan Mohan Rao, Deepak Kumar, Gagan Kumar and Dibakar Roy Chowdhury"Probing the near field inductive coupling in broadside coupled terahertz metamaterials", Journal of Selected Topics in Quantum Electronics vol.23, no.4, pp.7765087, [2016]

  • Maidul Islam and Gagan Kumar"Terahertz surface plasmons propagation through periodically tilted pillars and control on directional properties", J. Phys. D: Appl. Physics vol.49, no.43, pp.435104, [2016]

  • Gagan Kumar "Controlling terahertz surface plasmon properties on a periodically structured silicon surface ", Journal of Spectroscopy vol.Article ID, no. , pp. , [2015]

  • Shanshan Li, Mohammad M. Jadidi, Thomas E. Murphy, and Gagan Kumar "Plasmonic terahertz waveguide based on anisotropically etched silicon substrate", IEEE Transactions on Terahertz Science Technology vol.4, no. , pp.254, [2014]

  • J. R. Knab, X.-C. Lu, Felipe A. Vallejo, Gagan Kumar , Thomas E. Murphy, and L. Michael Hayden "Ultrafast carrier dynamics and optical properties of nanoporous silicon at broadband terahertz frequencies", Optical Material Express vol.4, no. , pp.300, [2014]

Conferences

  • Koijam Monika Devi, Amarendra K. Sarma and Gagan Kumar"Enhanced terahertz transmission through a periodic array of tapered rectangular apertures", XXVII IUPAP Conference on Computational Physics vol., no. , pp. , [December 2-5,2015]

  • Angana Bhattacharya, Koijam Monika Devi and Gagan Kumar "Toroidal Resonances in Graphene Metamaterials", 2019 Workshop on Recent Advances in Photonics (WRAP) (DOI: 10.1109/WRAP47485.2019.9013713) vol., no., pp.1 - 3, [2019]

  • Roopkiranpreet Kaur, Manpreet Kaur, P. C. Agarwal, Sukhdeep Kaur and Gagan Kumar "Simulation of Terahertz Propagation by TE Mode in Metal Dielectric Metal Waveguide", 2019 Workshop on Recent Advances in Photonics (WRAP) (DOI: 10.1109/WRAP47485.2019.9013713) vol., no., pp.1 - 3, [2019]

  • Rakesh Sarkar, Dipa Ghindani, Koijam Monika Devi, S. Jagan Mohan Rao, Shriganesh S. Prabhu and Gagan Kumar "Modulating dual-band electromagnetically induced transparency effect via near field coupling in planar terahertz metamaterials", 2019 Workshop on Recent Advances in Photonics (WRAP) (DOI: 10.1109/WRAP47485.2019.9013719) vol., no., pp.1 - 3, [2019]

  • KM Dhriti and Gagan Kumar "Study of resonant modes for sensing in a multimode planar plasmonic terahertz waveguide", 2019 Workshop on Recent Advances in Photonics (WRAP) (DOI: 10.1109/WRAP47485.2019.9013703). vol., no., pp.1 - 3, [2019]

  • R. Adarsh Bhargav, Km Dhriti, Angana Bhattacharya and Gagan Kumar "Refractive Index sensing using plasmonic mode in a periodically corrugated waveguide at terahertz frequencies", 2019 Workshop on Recent Advances in Photonics (WRAP) (DOI: 10.1109/WRAP47485.2019.9013714) vol., no., pp.1 - 3, [2019]

  • Koijam Monika Devi, Rakesh Sarkar, Amarendra Kumar Sarma and Gagan Kumar "Exploring polarization independent plasmon induced transparency in a planar terahertz metamaterial", 2019 Workshop on Recent Advances in Photonics (WRAP) (DOI: 10.1109/WRAP47485.2019.9013727) vol., no., pp.1 - 3, [2019]

  • 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]

  • Deepak Kumar, S. Jagan Mohan Rao, Gagan Kumar and Dibakar Roy Chowdhury"Modulating the Fundamental Resonances in Near Field Coupled Planar Terahertz Metamaterials", International conference Photonics-2016 vol., no. , pp. , [2016]

  • Maidul Islam, Dibakar Roy Chowdhury and Gagan Kumar"Terahertz guided mode propagation in a planar plasmonic waveguide and slow light properties", International conference Photonics-2016 vol., no. , pp. , [2016]

  • Deepak Kumar, S. Jagan Mohan Rao, Gagan Kumar and Dibakar Roy Chowdhury"Displacement Induced Resonances’ Tuning in Near Field Coupled Planar Terahertz Metamaterials", International conference “Frontiers of Physics and Plasma Science” vol., no. , pp. , [2016]

  • Gagan Kumar "Engineering terahertz propagation properties using plasmonic metamaterials on silicon", 12th International Conference on Fiber Optics and Photonics vol., no. , pp. , [2014]