Paper 13111-28
Paper 13111-28
Plasmonic-dielectric hybrid metasurfaces for emission and sensing application (Invited Paper)
20 August 2024 • 9:35 AM - 10:00 AM PDT | Conv. Ctr. Room 4
Abstract
The remarkable turnability with many degrees of freedom of metasurface has allowed for significant advancements in the field of optics. The direction and polarization of photon emission may be adjusted by coupling the geometric plasmonic metasurfaces with the dielectric Si cavity mode. Maintaining the Purcell factor, the hybrid structure with the designed configuration exhibits the highest electric field and best cross-polarization conversion efficiency. Through simulation, the Pancharatnam-Berry (PB) phase structure is effectively used to control the emission wavefront of both chiral and dipole emitters. One key characteristic for sensing applications is the enantiomeric interaction between chiral molecules and circularly polarized light. We use silicon disk metamaterials in conjunction with the P-B phase antenna to provide higher selectivity for real-time chiral sensing. It is also possible to enhance Circular Dichroism (CD) measurement. Experimental demonstration is conducted using L- and D-glucose.
Presenter
National Cheng Kung Univ. (Taiwan)
Wen-Hui (Sophia) Cheng received her Ph.D. from Caltech in Materials Science under supervision of Prof. Harry Atwater. Afterward, she joined Professor Dionne’s group as TomKat Postdoctoral Fellow at Stanford University. She has extensive experience with semiconductor nanofabrication and material characterization, in addition to optical simulations and device physics. As part of the JCAP, she has made an integrated device for splitting water with sunlight to make hydrogen fuel, and also demonstrated a gas diffusion electrode for CO2 reduction to generate CO from solar energy, both with record efficiencies at the time. She is now an Assistant Professor in the Department of Materials Science and Engineering at National Cheng Kung University in Taiwan. Her research interests include manipulating light to assist chemistry for energy application and engineering structure for optoelectronics as a material scientist.