Paper 13377-28
Paper 13377-28
Functional metasurfaces: atom trapping, wavelength-selective wavefront shaping, and nonlinear generation (Invited Paper)
29 January 2025 • 8:00 AM - 8:30 AM PST | Moscone Center, Room 70 (South Lower Mezz)
Abstract
Metasurfaces—structured planarized optical devices with a thickness comparable to the wavelength of light—can shape the optical wavefront either through the independent response of each meta-unit, or through a quasi-bound state in the continuum, which is a collective response over many meta-units. In this talk, I will report experimental demonstration of a few device functionalities: (a) “local” metasurfaces for trapping arrays of ultracold strontium atoms, (b) “nonlocal” metasurfaces based on CMOS-compatible dielectric materials with thermo-optically reconfigurable wavefronts, and (c) nonlinear resonant GaN metasurfaces growth by templated molecular beam epitaxy for efficient second harmonic and sum frequency generation.
Presenter
Columbia Univ. (United States)
Nanfang Yu is an Associate Professor of Applied Physics at the Department of Applied Physics and Applied Mathematics, Columbia University. His lab conducts experimental research on “flat optics”, which are nanostructured low-dimensional materials that can control light in previously unimaginable ways. The vision of Yu’s research is to replace conventional bulky optical devices and systems with their “flat” counterparts. Yu received the Ph.D. degree in Engineering Sciences from Harvard University in 2009, and the B.S. degree in Electronics from the Department of Electronics at Peking University, Beijing, China, in 2004. Yu is the recipient of 2022 Moore Experimental Physics Investigators Award, 2017 Defense Advanced Research Projects Agency (DARPA) Director’s Fellowship, 2016 Office of Naval Research (ONR) Young Investigator Program Award, and 2015 DARPA Young Faculty Award.