07/19/2022
By Sokny Long

The Francis College of Engineering, Department of Electrical and Computer Engineering, invites you to attend a Doctoral dissertation defense by Hang Li on “ Experimental Realization And Characterization of Multi-functional Optical Metasurfaces.”

Ph.D. Candidate: Hang Li
Defense Date: (Day of the week, Month, Day, Year) Tue, Aug.2,2022
Time: 1 to 3 p.m.
Location: This will be a virtual defense via Zoom. Those interested in attending should contact hang_li@student.uml.edu and committee advisor, hualiang_zhang@uml.edu, at least 24 hours prior to the defense to request access to the meeting.

Committee Chair (Advisor): Hualiang Zhang, Professor, Electrical and Computer Engineering, University of Massachusetts Lowell

Committee Members:
Xuejun Lu, Professor, Electrical & Computer Engineer, University of Massachusetts. Lowell
Wei Guo, Associate Professor, Physics & Applied Physics, University of Massachusetts. Lowell

Brief Abstract:
Metasurfaces are 2-dimensional artificial materials with subwavelength thickness. Metasurfaces can tailor wavefront as desired by providing spatially varying phases with array of subwavelength structures. In the past decade, metasurfaces have achieved groundbreaking progress in ultra-thin optical devices at mid-IR, near-IR, and optical wavelengths. Metasurfaces-based optical devices are compact, lightweight, and enable new functionalities that have big advantages over their conventional counterparts. Follow by the improvements in the fabrication process, it’s promising for metasurfaces to be incorporated into commercial applications.

In this proposal, the author theoretically studies the fundamental physics of the interaction between the metasurfaces and electromagnetic waves and experimentally demonstrates metasurfaces-based devices with multi-functionalities in plasmonic material platform: single/dual-wavelength filters, spatially coherence filters; in all-dielectric material platform: active phase tuning array, metalens for achromatic imaging. The fabrication process for the proposed metasurface-based devices is developed and optimized to improve the repeatability and cost-effectiveness.

All interested students and faculty members are invited to attend the online defense via remote access.