Bhagwat Singh Chouhan

Research Scholar, Department of Physics, IIT Guwahati

Focused on engineering active and passive broadband terahertz metamaterials for 6G communications and advanced photonic devices.

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About Me

Bhagwat Singh Chouhan working in the laboratory

I am a Ph.D. researcher in Physics at the Indian Institute of Technology (IIT) Guwahati, specializing in non‑linear optics and photonics. My academic journey includes a B.Sc. in Physics from the Regional Institute of Education, Bhopal, an M.Sc. in Physics from IIT Guwahati, and a Ph.D. in Physics (2020‑2025) with a thesis titled “Engineering Broadband Response in Active and Passive Terahertz Metamaterials Using Planar and Multilayer Configurations”.

My research targets the terahertz gap by designing active and passive metamaterials that enable broadband, polarization‑insensitive, and tunable responses. This includes planar and multi‑stacked structures incorporating phase‑transition materials such as VO2, perovskites and machine‑learning‑optimized designs for next‑generation communication and sensing applications. I have hands‑on experience building a terahertz time‑domain spectroscopy setup and mastering cleanroom fabrication techniques like electron beam lithography, photolithography and thin‑film deposition.

  • Ph.D. Physics, IIT Guwahati (2020‑2025)
  • M.Sc. Physics, IIT Guwahati (2017)
  • B.Sc. Physics, RIE Bhopal (2015)
  • Best Poster Awards at FTTA‑2021 & WRAP‑2022
  • Vice President, IEEE Photonics Society Student Chapter (2022‑24)

Research & Experience

Over five years of theoretical and experimental research on terahertz metamaterials, I design, fabricate and characterize novel devices that bridge the terahertz gap. My work encompasses planar filters, toroidal metasurfaces and multi‑stacked metamaterials with active tunability. I integrate semiconductors and phase‑transition materials to achieve tunable broadband responses, explore phenomena such as electromagnetically induced transparency and phonon‑polariton‑induced Rabi splitting, and employ machine learning for optimization.

Publications

Selected Journal Articles:

  1. Bhagwat Singh Chouhan et al., “Ultra‑broadband actively tunable terahertz modulator based on multi‑stacked metamaterial,” Scientific Reports, 15(1), 2025.
  2. Bhagwat Singh Chouhan et al., “Broadening of resonance with the bending of strongly coupled strip resonators in a planar terahertz metamaterial,” Journal of Lightwave Technology 42, 3283 (2024).
  3. Bhagwat Singh Chouhan et al., “Multi‑stacked polarization‑insensitive broadband terahertz metamaterial,” Journal of Applied Physics 135, 173103 (2024).
  4. Bhagwat Singh Chouhan et al., “Machine learning‑driven ultra‑broadband terahertz multilayer metamaterial,” Journal of Lightwave Technology (2024).
  5. Angana Bhattacharya, Bhagwat Singh Chouhan et al., “Terahertz binary computing in a coupled toroidal metasurface,” Scientific Reports 14, 8721 (2024).
  6. Lavi Kumar Vaswani, Bhagwat Singh Chouhan et al., “Single and dual‑band electromagnetically induced transparency in a strongly near‑field coupled planar toroidal terahertz metamaterial,” Optics & Laser Technology 176, 111006 (2024).

Conference Contributions

  1. Bhagwat Singh Chouhan et al., “Modulating broadband terahertz in a graphene‑assisted dielectric metamaterial,” Workshop on Recent Advances in Photonics (WRAP‑2022).
  2. Bhagwat Singh Chouhan et al., “Graphene‑dielectric based tunable terahertz polarization‑insensitive modulator,” IEEE Photonics Conference 2022.
  3. Bhagwat Singh Chouhan et al., “Polarization‑insensitive ultra‑broadband terahertz metamaterials for 6G applications,” META‑2024.
  4. Angana Bhattacharya, Bhagwat Singh Chouhan et al., “Electromagnetically induced transparency in broadside‑coupled toroidal metasurfaces,” WRAP‑2024.

Patent

Title: Ultra‑broadband actively tunable terahertz modulator based on multi‑stacked metamaterial and a method of preparation (Application No. 202431065). Status: early publication completed and under examination.

Professional Experience

Doctoral Researcher

Indian Institute of Technology, Guwahati (2020–2025)

Main investigator of projects on terahertz metamaterials, responsible for developing a THz‑TDS laboratory, and initiating collaborations. Published multiple peer‑reviewed papers and filed a patent.

Research Project Student

Indian Institute of Technology, Guwahati (2015–2017)

Investigated electro‑optical properties of photochromatic bio‑nano hybrids during master’s studies, exploring optical doping and charge transport dynamics in thin films.

Leadership & Teaching

Vice President (2022‑24) and Secretary (2020‑22) of the IEEE Photonics Society Student Chapter at IIT Guwahati. Assisted with postgraduate physics laboratory courses and mentored undergraduate and graduate students in terahertz and metamaterials research.

Awards & Recognitions

Events & Activities

Conferences (selected)

  1. IEEE Silicon Photonics (London, 2025).
  2. Photonics‑2024 (16th International Conference on Fiber Optics and Photonics).
  3. QMAT‑2024 (7th Annual Conference on Quantum Condensed Matter).
  4. Research & Industrial Conclave (RIC‑2024), IIT Guwahati.
  5. META‑2024 (14th International Conference on Metamaterials, Photonic Crystals and Plasmonics).
  6. ISPEC‑2024 (India Semiconductor and Packaging Ecosystem Conference).
  7. ICANN‑2023 (International Conference on Advanced Nanomaterials & Nanotechnology).
  8. IFCFPM‑2023 (Indo‑French Conference on Photonics and Metamaterials).
  9. RIC‑2022, IPC‑2022, FTTA‑2021.

Workshops & Schools

  1. Workshop on Advancements and Applications of Analytical Instruments (AAAI‑2024).
  2. INUP‑2022: Indian Nanoelectronics Users Program.
  3. IEEE Sensors Winter School 2023.
  4. ICTP Winter College on Optics: Terahertz Optics and Photonics (2023).

Symposiums & Meetings

  1. Frontiers in Optics & Terahertz Photonics (FiOTP‑2024 & FiOTP‑2023).
  2. Frontier in Metasurfaces & Terahertz Photonics (FiMTP‑2025).
  3. INUP Users’ Meet, IIT Bombay – 10 Aug 2024.

Memberships & Service

Featured Research Visuals

Functional metamaterials patterns
Functional metamaterial designs, including broadband lattice‑coupled and toroidal structures.
Multi‑stacked metamaterials
Schematic of a flexible multi‑stacked metamaterial and fabricated samples used for ultra‑broadband modulation.

Contact

Email: bhagwatsingh@iitg.ac.in

Address: Department of Physics, Indian Institute of Technology Guwahati, Guwahati, India.