Biswadev Roy

Dr. Roy works as a research professor at the NCCU CREST center and is currently involved with UNC-GA ROI on experiments such as a "very fast time-resolved millimeter wave conductance (TRmmWC) system for applications to inorganic/organic and hybrid perovskite materials," apparatus calibration, data acquisition and analysis to study charge dynamical and dielectric properties including wide-band gap and 2D materials.

He is also involved with a National Science Foundation (NSF) project in collaboration with ORaCEL at NC State University and a planned experimental study on studying the effects of non-ionizing radiation on prostate cancer cells in collaboration with BBRI, NCCU. His secondary responsibility is to continue to experiment, maintain radiation safety and automate a custom-built 1.2-MeV NCCU electron linear accelerator facility (EAF), and write grant proposals for requesting funds to convert the EAF to reliable high-average-energy pulsed THz source, deposition studies.

Dr. Roy independently writes and collaborates in research proposals for obtaining grants from various agencies in these areas and continues to publish results in peer-reviewed journals and conference proceedings. Dr. Roy volunteers his time to the Sigma-Xi Scientific Honor Society and the summer research science program (SRSP) at NCCU. He is a regular member of the Sigma Xi Honor Society, the American Physical Society (APS) and the Institution of Electrical and Electronics Engineering (IEEE).

Dr. Roy's has accomplished setting up a free space time-resolved millimeter-wave transient conductivity measurement facility (TRMMWC) with picosecond resolution at the NCCU laboratory for material characterization and microwave applications. This setup was completed using a electrovacuum backward wave oscillator (BWO) as a probe source (resembling the well-known flash photolysis technique), an actively Q-switched diode pumped 532-nm solid-state laser system as the pump source, a zero-bias Schottky diode detector and a very high-resolution transient digitizer.

A large number of datasets have already been obtained for mon0-/multi crystalline Silicon, Gallium Arsenide, CdX (X=S, Se), Silicon Dioxide with Germanium nanocrystals, c-Si irradiated with Gamma, Proton and Chlorine ions. DC responses from 21 organic materials are also being currently analyzed for studying in detail their dielectric properties using probe spectra. Current work involves TRMMWC system characterization and sensitivity analyses using known PV silicon samples (with variety of resistivity), and related modeling.

Dr. Roy is currently exploring application of the d.c. reflection and transmission datasets for various inorganic, organic and hybrid samples to study dielectric properties. He is also exploring the application of magneto-optical spectroscopy of solids using the existing BWO facility at NCCU and writing a proposal/white paper on the creation of a sub-millimeter resonator-spectrometer (Fabrey-Perot type) for condensed matter and atmospheric applications in the 45–370 GHz range. The NCCU S-band linear electron accelerator facility (EAF) is also being operated and aligned for electron-beam aided nano-deposition, quantum-dot fabrication, Al foil coherent transition radiation (CTR) for terahertz source, UED, and Bremsstrahlung for radiation studies, as well as training.