Dr. Roy works as research professor at the Center for Aerospace Device Research & Education and under the CREST-CCFASE program. His primary responsibility is to maintain and automate the custom built electron linear accelerator system (EAF) and the microwave open resonator system laboratory used for mm wave and THz material conductivity studies & characterization. Dr. Roy independently writes and collaborates in research proposals for obtaining grants from various agencies in the areas of performance improvement of the NCCU RF electron linear accelerator system and applications such as microwave/THz conductivity studies of OPV materials, pulsed coherent transition radiation for material application and research, and advanced atmospheric sensor based data analyses.
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 electrovaccum backward wave oscillator (BWO) as probe source(resembling the well known flash photolysis technique), an actively Q-switched diode pumped 532 nm solid-state laser system as pump source, zero-bias Schottky diode detector and a very high resolution transient digitizer. Current work involves TRMMWC system characterization and sensitivity analyses using known PV silicon samples (with variety of resistivity), and related modeling. Also exploring application of magneto-optical spectroscopy of solids using existing BWO facility at NCCU and writing proposal/white paper on creation of a sub-millimeter resonator-spectrometer (Fabrey-Perot type) for condensed matter and atmospheric applications in the 45-370 GHz range. NCCU S-band linear electron accelerator facility (EAF) is also being operated and aligned for electron-beam aided nanodeposition, quantum-dot fabrication, Al foil coherent transition radiation (CTR) for terahertz source, UED, and Bremsstrahlung for radiation studies, and training.