MSE Seminar Series Presents - Prof. Lan Yang

Tuesday, March 29, 2022 at 2:00pm to 3:00pm

Building 6, 6-104, Chipman Room
182 MEMORIAL DR (REAR), Cambridge, MA 02139

Title: Opportunities in optical microresonators: fundamentals and applications

Abstract: Light-matter interactions are the fundamental basis for many phenomena and processes in optical devices. This talk will cover ultra-high-quality whispering-gallery-mode (WGM) optical microresonators which provide an unprecedented capability to trap light in a highly confined volume smaller than a strand of human hair. Light beams can travel around the boundary of a WGM resonator over 10^6 times, significantly enhancing light-matter interactions, creating the potential for a wealth of new scientific discoveries and technological breakthroughs. 

High-Q microresonators and microlasers have great potential for both fundamental science and engineering applications; the choices of materials for the photonic resonators enable various opportunities for different applications. Examples range from low-threshold lasers to parity-time-symmetric resonators and their application for sensing and nonreciprocal light transmission. Our recent exploration of fundamental physics, such as light-matter interactions around exceptional points (EPs) in high-quality WGM resonators, unravels innovative strategies to achieve a new generation of optical systems enabling unconventional control of light flow. Examples including loss engineering in a lasing system, directional lasing emission, and EPs enhanced sensing will be presented. I will also reveal an interesting finding of mechanical solitons through optomechanical effects in a microtoroid resonator. The conclusion of this talk will discuss a barcode technology based on collective behaviors of multiple resonances for sensing applications.

Our research discoveries just represent a glimpse of the potentials of photonic resonators; there are still many exciting opportunities by leveraging the enhanced light-matter interactions through resonant effects in the future. 

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engineering, Seminar, materials science

Materials Science and Engineering Seminar Series
Department of Materials Science and Engineering (DMSE)


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