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GaN HEMTs
GaN HEMTs
Our research focuses on Gallium Nitride (GaN) High Electron Mobility Transistors (HEMTs), which are essential for high-power and high-frequency applications due to their wide bandgap, high breakdown field, and superior electron mobility. We explore these devices through a combination of simulation and experimental studies to better understand and optimize their performance. On the simulation front, we analyze heterostructures to study two-dimensional electron gas (2DEG) formation, electron density, and strain distribution. Device-level simulations are carried out to evaluate current-voltage characteristics, breakdown voltage, on-resistance (Ron), and high-frequency performance parameters. Experimentally, we investigate the impact of process parameters such as etching and contact formation on device behavior. Defect analysis is an integral part of our work, employing techniques such as conductance-voltage (G-V) measurements, temperature-dependent photoluminescence (PL), and X-ray photoelectron spectroscopy (XPS) to correlate material quality with device reliability. Through this integrated approach, we aim to develop a deeper understanding of GaN HEMTs and contribute to their advancement for next-generation power and RF electronics.
Carbon Quantum Dots for Photonics Applications
Carbon Quantum Dots for Photonics Applications
Our research explores the synthesis and application of Carbon Quantum Dots (CQDs) derived from organic and eco-friendly sources such as pollens (e.g., Hibiscus rosa-sinensis, Sphagneticola trilobata L.), petals, and leaves from plants like Syzygium cumini, Ocimum sanctum, Azadirachta indica, Psidium guajava, Mangifera indica, and Bergera koenigii. Utilizing a cost-effective and scalable microwave-assisted synthesis process, we produce CQDs exhibiting quasi-spherical morphology, strong red fluorescence, and high photostability, as confirmed through detailed structural and optical characterization. These CQDs show strong potential in photonic and biomedical applications, having demonstrated selective detection of Fe²⁺, Co²⁺, and Ni²⁺ ions, alongside notable antioxidant and antibacterial activity. The eco-friendly synthesis approach and multifunctional performance position these CQDs as promising candidates for bioimaging, plant health monitoring, chemical sensing, and next-generation photonic devices.
QD-based Single Photon Sources
QD-based Single Photon Sources
We are investigating quantum dot (QD)-based single photon sources for secure quantum communication, with a focus on operation within the telecommunication wavelength range. Our approach integrates computational design and experimental synthesis to optimize source performance. Using the Lumerical photonic simulation suite, we design QD-integrated nanocavities and analyze key parameters such as collection efficiency, Purcell factor, mode volume, and quality factor (Q) to enhance light–matter interaction and spontaneous emission rates. We also evaluate the far-field radiation pattern to understand the emission directionality, and compute the beta factor to quantify coupling efficiency into the desired optical mode. Transmission spectra are analyzed to verify cavity resonance and emission alignment. Experimentally, we employ the colloidal synthesis route to fabricate QDs with tunable emission properties, aiming for scalable, room-temperature-operable single photon sources. This combined simulation–experimental framework supports the development of high-performance, fiber-compatible quantum emitters for photonic and quantum communication platforms.
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