Dr. Dimitrios Sounas

Department of Electrical and Computer Engineering, The University of Texas at Austin

Non-Reciprocal Metamaterials with Time Modulation and Non-Linear Effects

Abstract

Metamaterials have attracted significant attention for their extraordinary properties, not found in natural materials. Realized as regular arrangements of relatively simple elements, metamaterials have so far been shown to exhibit fascinating phenomena, such as anomalous refraction, cloaking, and extraordinary field localization and enhancement. In this talk, I will discuss how metamaterials can be pushed even further up to the point of breaking fundamental physical symmetries, such as time-reversal symmetry or reciprocity, providing a new degree of control over wave phenomena in various physical systems, including electromagnetics, optics and acoustics. I will show that by introducing spatiotemporal modulation in metamaterials, it is possible to achieve giant non-reciprocity without magnetic materials, with applications in the development of full-duplex communication systems and the design of efficient acoustical imaging devices. Furthermore, I will show that by pairing spatial asymmetries with non-linear effects, we can break reciprocity and design all-passive metasurfaces with asymmetric transmission for opposite propagation directions, with applications in the protection of sensitive equipment from strong interfering signals. More broadly, during my talk, I will discuss the role of time-reversal symmetry on classical wave phenomena and the opportunities available for breaking this fundamental symmetry and designing devices with unprecedented functionalities.



Date: 3/10/2016
Time:12:00 (coffee & cookies will be served at 00:00)
Place:Seminar room IACM building C