Seminar

Large-scale Linear-to-Circular Polarization Converter with a Broad Polarization Angular Span Based on Multilayer Metasurfaces

Speaker

Mr. Jiang Zijie

PhD candidate in the Mechanical Engineering Dept.

Date & Time

Thursday, 29 April 2021

7:00 am

Venue

Via Zoom

Abstract:

Linear-to-circular polarizer (LCP) is a device that can convert linear polarization into circular polarization, and is widely used in the wireless communication, spectroscopy, quantum materials, and some other areas. The conventional LCPs are based on a quarter-wave plate made by some birefringent crystals, which is usually bulky and can only work at a single polarization angle and frequency. The advent of metasurfaces provides a new avenue towards practical LCPs. Several metasurface-based LCPs are proposed and successfully demonstrated in the microwave, terahertz, and optical regions based on different design principles. Compared with conventional LCPs, metasurface-based polarizers have the advantages of subwavelength thickness, high efficiency, and broad bandwidth. However, most of them still work at a single polarization angle. Moreover, in the optical region, the size of polarizers is greatly limited by the fabrication methods. In this presentation, a linear-to-circular polarizer valid for a broad polarization angular span is proposed, and it can be fabricated by using interference lithography to achieve a cm-scale size.

Research Areas:

Advanced Materials

Contact for

Information

Dr. W.D. Li

+(852) 3917 8982

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