Cheng Wang

Department of Electrical Engineering, City University of Hong Kong, Hong Kong SAR, China

Biography:
Dr. Cheng Wang is an Associate Professor of Electrical Engineering at City University of Hong Kong. He received his B.S. degree in Microelectronics from Tsinghua University in 2012, and his S.M. (2015) and Ph.D. (2017) degrees, both in Electrical Engineering from Harvard University, supervised by Prof. Marko Lončar. After conducting research as a postdoctoral fellow at Harvard, he joined City University of Hong Kong as an Assistant Professor in 2018. Prof. Wang's research focuses on the design and nanofabrication technology of integrated photonic devices and circuits. His current research effort focuses on realizing integrated lithium niobate photonic circuits for applications in optical communications, millimeter-wave/terahertz technologies, nonlinear optics, and quantum photonics. Since joining CityU, Prof. Wang has received a number of awards in research, including the Croucher Innovation Award (2020), 35 Innovators Under 35 (China) by MIT Technology Review (2021), and Alibaba DAMO Academy Young Fellow (2024).

Sujet de la présentation : Integrated lithium niobate microwave and terahertz photonics

Abstract:
Integrated microwave photonics is a powerful technology that leverages integrated photonic technologies for the generation, transmission, and manipulation of microwave signals in chip-scale optical systems. In this talk, I will discuss our recent efforts on developing a thin-film lithium niobate (TFLN) microwave photonic platform that simultaneously features efficient, linear, and high-speed electro-optic modulators for high-fidelity microwave-optic conversion, low-loss functional photonic networks that can be configured for a variety of signal processing tasks, as well as large-scale, low-cost manufacturability. I will first discuss a variety of high-performance device-level building blocks, including low-loss photonic waveguides and resonators (0.03 dB/cm), broadband electro-optic modulators covering the entire millimeter-wave and partly terahertz bands (up to 500 GHz), broadband power-efficient frequency comb sources, as well as ultra-compact inverse-designed photonic elements. Building upon this platform, we further demonstrate high-performance microwave and terahertz photonic system-level applications, including ultrahigh-speed analog signal processing, integrated photonic millimeter-wave radars, broadband real-time RF spectrum sensing, and full-band reconfigurable wireless communications. 

Website: https://www.ee.cityu.edu.hk/~cwang/