Department of Applied Physics and Materials Science - Applied Physics

Caltech Young Investigators Lecture

Wednesday March 13, 2019 4:00 PM

Chip-Scale Nonlinear Photonics and its Applications

Speaker: Mengjie Yu, PhD, Harvard University
Location: Spalding Laboratory 106 (Hartley Memorial Seminar Room)

Abstract: Over the past decade, the development of nanoscale photonic technology has provided a highly promising platform for efficient nonlinear optical interactions at low optical powers and for integration of optical and electronic devices on a single chip. Such capabilities have opened opportunities for new chip-scale applications including molecular spectroscopy, optical metrology and optical computing.

In this talk, I will present our recent work on applications in nonlinear photonics using silicon and lithium niobate-based platforms. In addition, I will discuss our work on microresonator based optical frequency comb (OFC), a coherent light source composed of evenly spaced, low-noise spectral lines. By combining a powerful technique of dispersion engineering with the advancement of ultralow loss silicon photonics, we extend such chip-based OFC’s to the mid-infrared (mid-IR) spectral regime, a gold mine for molecular fingerprinting and remote sensing. I will discuss chip-based mid-IR OFC generation and its applications for dual-comb spectroscopy and tunable comb spectroscopy. Furthermore, I will present our work on degenerate optical parametric oscillators using a Si3N4 microresonator, and its application for quantum random number generation and the coherent Ising machine.


More about the Speaker: Mengjie Yu is a postdoctoral fellow in Professor Marko Loncar’s group in the John A. Paulson School of Engineering and Applied Sciences at Harvard University. She received her B.S. degree in Optical Engineering in 2012 from Zhejiang University and her Ph.D. degree in Electrical Engineering in 2018 from Cornell University in Professor Alexander L. Gaeta’s group. Her research areas include optical frequency comb generation in photonic waveguides and microresonators, mid-infrared molecular spectroscopy, and coherent computing based on degenerate optical parametric oscillation. Mengjie Yu is the winner of the 2016 Maiman Student Paper Competition and the 2016 Emil Wolf Student Paper Competition. She is also a semi-finalist of the 2017 Tingye Li Innovation Prize. She has published 20 peer-reviewed journal papers and 28 conference papers and is a referee for 15 peer-reviewed journals. She is serving as chair of the OSA Integrated Optics Technical Group.

This lecture is part of the Young Investigators Lecture Series sponsored by the Caltech Division of Engineering & Applied Science.

Series Caltech Young Investigators Lecture Series

Contact: Jennifer Blankenship at 629-395-8124 jennifer@caltech.edu