THz and Ultrafast Photonics Group 

Research Focus 

The THz and Ultrafast Photonics Group at IIT Indore is dedicated to pioneering research in Terahertz technology. Our primary focus includes:

• Photoconductive THz sources and detectors: GaAs and Ge based photoconductive THz sources and detectors.  Devices are characterized in collaboration with various labs, including TIFR Mumbai, HZDR Dresden Germany, RUB Bochum Germany,  and RRCAT Indore.

• Terahertz Spectroscopy and Imaging: Developing innovative Terahertz devices and systems for advanced spectroscopy and imaging applications.

Recent Publications 

Google scholar: https://scholar.google.com/citations?user=WLjMmMMAAAAJ&hl=en

• 1. Dhanashree Chemate*, Abhishek Singh*, Utkarsh Pandey, Ruturaj Puranik, Gaurav Mota, Niranjan Jadhav, Siddhartha P Duttagupta, Shriganesh S Prabhu, Terahertz detection using germanium-based photoconductive antennas on various substrates, Journal of Applied Physics 139 203105 (2026)   https://doi.org/10.1063/5.0331931

  2. Dhanashree Chemate*, Abhishek Singh*, Ruturaj Puranik, Utkarsh Pandey, Dipti Gupta, Siddhartha P Duttagupta, Shriganesh S Prabhu, Terahertz emission from interdigitated photoconductive antennas based on Ge-on-Si, Physica Scripta 101 225502 (2026),  DOI 10.1088/1402-4896/ae6e7d

  3. Dhanashree Chemate*, Abhishek Singh*, Utkarsh Pandey, Ruturaj Puranik, Vivek Dwij, Priyanshu Gahlaut, Siddhartha P. Duttagupta, Shriganesh S. Prabhu; Terahertz emission and detection using Ge-on-Si photoconductive antennas. Appl. Phys. Lett. 11 May 2026; 128 (19): 193504. https://doi.org/10.1063/5.0323417

  4. Mohsen Khalili, Tim Vogel, Yicheng Wang, Samira Mansourzadeh, Abhishek Singh, Stephan Winnerl, Clara J Saraceno, “Microstructured large-area photoconductive terahertz emitters driven at high average power,” Optics Express, 32 (13), 22955-22969 (2024).

Collaborators

• Tata Institute of Fundamental Research, Mumbai

• Indian Institute of Technology Bombay, Mumbai

• CENSE, IISc Bangalore

• Raja Ramanna Centre for Advanced Technology, Indore 

• Helmholtz-Zentrum Dresden-Rossendorf, Germany

• Ruhr University Bochum, Germany

Funding Agencies

Anusandhan National Research Foundation (ANRF) 

[ formerly Science and Engineering Research Board (SERB) ]

Selected Publications

• Microstructured large-area photoconductive terahertz emitters driven at high average power : High THz power.

• Up to 70 THz bandwidth from an implanted Ge photoconductive antenna excited by a femtosecond Er:fibre laser : Largest THz bandwidth from PCA ever reported.

• High-field THz pulses from a GaAs photoconductive emitter for non-linear THz studies : One of the largest THz field reported from such PC THz sources.