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.
In this talk, I will report our progress in realizing three-dimensional (3D) double-zero-index materials for both electromagnetic and acoustic waves. Their intriguing properties, including wave tunneling and cloaking objects, will be discussed. Then I will delve into our recent realization of a 2D double-zero-index material for air borne sound using space-coiling structures. The special features of a space-coiling unit, such as super-anisotropy and degenerate resonance, will also be discussed.
References:
[1] Changqing Xu, et al “Three-Dimensional Acoustic Double-Zero-Index Medium with a Fourfold Degenerate Dirac-like Point” Phys. Rev. Lett. 124, 074501 (2020)
[2] Changqing Xu, et al "Three-dimensional electromagnetic void space" Phys. Rev. Lett. 127, 123902 (2021)
[3] Changqing Xu, et al Appl. Phys. Lett. 119, 224102 (2021)
[4] Changqing Xu, et al Phys. Rev. Appl. 15 054025 (2022)
[5] Jiajun Zhao., et al J. Acoust. Soc. Am. 142 EL 24 (2017)
[6] Mayram Landi, et al Phys. Rev. Lett. 120 114301(2018)
Biography
Dr. Ying Wu joined the Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division at King Abdullah University of Science and Technology (KAUST) in October 2010 as an Assistant Professor in Applied Mathematics and Computational Science (AMCS) and was promoted to Associate Professor in 2017. Later she became co-affiliated with the Applied Physics and Electrical and Computer Engineering Programs. She was recently promoted to Professor, effective from July 1st, 2024. Dr. Wu received her BSc from Nanjing University in 2002 and PhD from the Hong Kong University of Science and Technology (HKUST) in 2008. Prior to KAUST, she worked as a post-doctoral fellow at HKUST. Dr. Wu’s research focuses on analytic and numerical models for wave propagation in complex media, with particular interests in homogenization and artificial structures. She serves as an associate editor for Wave Motion (2018-present) and EPL (2018-2023) and as a board member of the International Phononics Society (IPS) (2022-present). She was honored with the Young Investigator Award by IPS for her contributions to the field.
Anyone interested is welcome to attend.