Professor Daniel M. Mittleman, Brown University
Terahertz Metasurface Slab Waveguide
Abstract: We describe experimental measurements and simulations of a switchable THz metasurface device. We characterize the switching using terahertz ellipsometry, and extract parameters which enable us to model the device in a slab waveguide geometry. In this configuration, with the extended interaction path between the propagating mode and the meta-elements, the device exhibits giant phase modulation of the TE1 waveguide mode. Simulations predict that a 2π phase shift can be realized in an interaction length of less than one millimeter, for a range of frequencies near the in-plane resonance. This device offers new possibilities for phase modulation and beam steering.
About: Dr. Mittleman received his B.S. in physics from the Massachusetts Institute of Technology in 1988, and his M.S. in 1990 and Ph.D. in 1994, both in physics from the University of California, Berkeley , under the direction of Dr. Charles Shank . He then joined AT&T Bell Laboratories as a post-doctoral member of the technical staff, working first for Dr. Richard Freeman on a terawatt laser system, and then for Dr. Martin Nuss on terahertz spectroscopy and imaging. Dr. Mittleman joined the ECE Department at Rice University in September 1996. In 2015, he moved to the School of Engineering at Brown University . His research interests involve the science and technology of terahertz radiation. He is a Fellow of the OSA, the APS, and the IEEE, and is currently serving a three-year term as Chair of the International Society for Infrared Millimeter and Terahertz Waves.