My research deals with optical technologies, primarily for communications, signal processing, and networking. Specifically, my research group at USC has explored various issues related to: (a) limitations in fiber and free-space communications, (b) wavelength and spatial multiplexing of different beams of light for capacity enhancement, (c) utilizing nonlinear effects to achieve high-speed optical signal processing, … Continued
I work on miniature biomedical and MEMS devices including drug pumps, intraocular lens, retinal implants, cortical implants, spinal cord implants, circulating tumor cell (CTC) analysis, blood analysis on-a-chip, and so on. The research often involves broad materials, design, technology and fabrication topics.
My research focuses on nanoscale device physics, at the boundary where photons interface with phonons, spins, and superconductors and the strong light-material interaction gives rise to new opportunities in classical and quantum regimes. One such example is the gradient optical force phenomena we have experimentally demonstrated for building chip-scale cavity nano-optomechanics. Another example is waveguide … Continued
Our group studies nanoscale heat transport and electrothermal energy conversion in order to improve electronic and optoelectronic devices. We have also developed novel lock-in imaging techniques to obtain thermal maps with sub diffraction-limit spatial resolution and 800ps time resolution. We are applying similar methods to enable real-time roll-to-roll process monitoring for smart film manufacturing. We … Continued
My interdisciplinary research group uses analog circuits and analog computation as a universal language to design advanced quantum, bio-molecular, and nano-electronic circuits and systems, from atom to living cell. These systems are experimentally implemented in living synthetic microbial DNA-RNA-protein circuits in his wet lab, and in nano-electronic supercomputing chips that emulate or are inspired by … Continued
My research interests lie on the boundaries between applied mathematics, signal processing, optimization, and machine learning. My recent work includes new techniques for solving certain kinds of nonlinear equations using convex programming, using randomized linear algebra to develop a new framework for array imaging, and methods for making neural networks more computationally efficient that come … Continued
My research interests are at the crossroads of seeking out new photonic device concepts based on ideas in electromagnetism and device physics using light and its interaction with matter, and CMOS chip technology. In 2015, my research group, with collaborators, demonstrated the world’s first microprocessor chip that communicates with the outside world using light. In … Continued
My research is on the mathematical analysis of engineering networks. The key challenge is to understand how a huge distributed network like the Internet or the power grid, may operate to allocate its resources in a fair, efficient and timely manner. Mathematical tools from dynamics and control, convex optimization, economic theory and queueing theory are … Continued
I am currently investigating molecular clocks based on iodine in the gas phase. In collaboration with a group at Stanford, we are attempting to reach theoretical limits in compact packages (<1 cm^3) that previously were only attainable in large laboratory settings. The work entails the study of fundamental line broadening and shifting mechanisms due to … Continued
Wireless has evolved from Marconi’s kiloscale station-to-station telegraphy, through megascale station-to-people broadcasting, to today’s gigascale people-to-people cellular telephony. The Internet of Everything could take us to the terascale. My research is focused on overcoming the impediments to achieving that scale. Current research concerns beamforming and steering arrays for wireless power transfer, and field-programmable things arrays … Continued