2019 Physics/Theoretical Colloquium

 

Thursday, May 30th , 2019

3:45 – 4:45 p.m.

Rosen Auditorium (TA-53, Bldg. 001)

 

Refreshments at 3:15pm

 

Speaker:   Dr. Hou-Tong Chen

 

Center for Integrated Nanotechnologies, Los Alamos National Laboratory

 

 

 

“Metasurfaces: Physics and Applications”

 

Abstract: 

 

Two-dimensional metamaterials – metasurfaces – offer tremendous opportunities in realizing exotic optical phenomena and functionalities. Through tailoring the resonant response of basic building blocks as well as their mutual interactions, they enable effective control of amplitude, phase, and polarization state of optical reflection, transmission, absorption and emission, as well as wavefront shaping and beam forming. By integrating functional materials such as semiconductors and graphene at critical regions of the resonators, hybrid metasurfaces allow enhanced light-matter interactions and accomplish dynamic switching, active tuning, and enhanced nonlinearity. In this talk I will present the augmented metasurface functionalities, particularly in the terahertz frequency range, through both structural design and materials integration. The unique capabilities have made metasurfaces of great importance and promising potential in addressing the longstanding challenges encountered in the field of terahertz science and technologies.