Speaker: Prof. Ting-Hua Lu, Department of Physics, National Taiwan Normal University

Place: NTHU Physics Department,  Room 124

Time: 10/19, 13:30

Title: Structured light and its applications
 
Abstract: This talk includes the introduction of the structure light especially focus on the twisted light. The light possessing helical wavefront and orbital angular momentum is called an optical vortex beam or twisted beam. The most common form of the helically phased beam is the so-called Laguerre–Gaussian (LG) mode. The LG mode can be easily produced by conversion of Hermite-Gaussian (HG) mode directly from laser cavities. However, there are various techniques for generating the structural or twisted light by the Gaussian beam, such as (1) liquid crystal spatial light modulator, (2) cylindrical lens, (3) q-plates, etc. The twisted light has unique optical properties due to the existence of an extra degree of freedom as compared to that of the polarized beam. It opens a new window of physics while structured light interacts with matters, such as 2D semiconductor materials. Another topic in this talk will be the structured light-matter interaction. Currently, my group mainly focuses on studying the structural light-matter interaction of transition metal dichalcogenide (TMD) materials including photoluminescence and Raman spectroscopy.