For Attendees' Attention:

This lecture will be held physically at the IAS Lecture Theater and online via Zoom. Onsite seating is offered to those who have access right to HKUST Clear Water Bay Campus only. Other interested parties please join the lecture online via Zoom.

- To join the lecture in person: No registration is required. Seats are limited and will be given on a first-come-first-served basis.
- To join the lecture online: Please join the webinar at https://hkust.zoom.us/j/94074775639 (meeting ID: 940 7477 5639 / Passcode: iasDL0121).

Abstract

Wave propagating in a medium with one or more constitutive parameters vanishing does not accumulate any phase retardation and the medium is the so-called zero-index medium. Such a medium is not mathematically interesting but also bears unusual functionalities, such as wave front engineering, cloaking of objects and wave tunnelling. Ever since its emergence, achievements in this field have been mostly focused on two-dimensions. Three-dimensional (3D) double-zero-index material, while interesting, has never been realized before due to its internal complexity. In this lecture, the speaker will introduce her most recent work on the realizations of double-zero-index materials in three-dimensions. She will start by presenting her design for an acoustic 3D double-zero-index material, followed by introducing the case for its electromagnetic counterpart. Their common features, such as wave tunneling, and distinct properties, including cloaking of objects, will be discussed in details. Both numerical simulation and experimental results will be presented.

About the speaker

Prof. WU Ying received her PhD in Physics from HKUST in 2008, which was followed by a two-year postdoctoral fellowship. In 2010, she joined the King Abdullah University of Science and Technology in Saudi Arabia and is currently an Associate Professor of Applied Mathematics and Computational Science.

Prof. Wu's research interests are in the areas of computational physics with a focus on wave propagation in heterogeneous media, such as electromagnetic, acoustic and elastic metamaterials, effective medium theories, transport theory, time reversal imaging and super-resolution. Her research also extends to the implementation of fast algorithms in solving large-scale, classical wave propagation problems.