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Past Events
Controlling Classical Wave Propagation in Complex Media: Breaking the Limits
| Speaker: | Dr. Ying Wu |
| Affiliation: | Division of Computer, Electrical and Mathematical Science and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia |
| Date: | April 11, 2018 (Wednesday) |
| Time: | 11:00 a.m. |
| Venue: | Room 522, 5/F, Chong Yuet Ming Physics Building, HKU |
Abstract
As one of the most fundamental concepts in science and engineering, wave-medium interaction has undoubtedly innovated numerous technologies that have deeply changed our world. The developments of wave-based technologies, however, are hindered by various limitations in wave-medium interaction, such as size limit, frequency limit and material limit. Thus, profound understanding and effective modeling of wave propagation in complex media beyond the existing limits are highly desired. In this talk, I will introduce my contributions in modeling classical wave propagation in complex systems by emphasizing on the following two aspects: metamaterials, and classical topological materials. I will start with a brief review of my work on effective medium theories that can go beyond the quasi-static limit, followed by a demonstration of how our theories can guide the explorations of new metamaterials and metasurfaces that break the material parameter and size limits. Then, I will reveal the link between a zero-index material and linear dispersion relations in periodic structures beyond the long-wavelength limit, and introduce a general perturbation theory to characterize the linear dispersions. The so-called Dirac-like cones and double-Dirac cones as well as their links to the classical analogues of topological materials will be discussed.
[1] Maryam Landi, Jiajun Zhao, Wayne E. Prather, Ying Wu and Likun Zhang Phys. Rev. Lett. (Accepted)
[2] Jiajun Zhao, Likun Zhang and Ying Wu J. Acoust. Soc. Am. 142 EL24 (2017)
[3] Xiujuan Zhang and Ying Wu Opt. Express 25, 4860(2017)
[4] Xiujuan Zhang and Ying Wu Sci. Rep. 5, 7892 (2015)
[5] Ying Wu, Yun Lai, and Zhao-Qing Zhang Phys. Rev. Lett. 107, 105506 (2011)
[6] Yun Lai, Ying Wu, Zhao-Qing Zhang, and Ping Sheng Nat. Mater. 10, 620 (2011)
[7] Ze-Guo Chen, Jun Mei, Xiao-Cheng Sun, Xiujuan Zhang, Jiajun Zhao and Ying Wu Phys. Rev. A 95 043827 (2017)
[8] Jun Mei, Ze-Guo Chen and Ying Wu Sci. Rep. 6 32752 (2016)
[9] Ze-Guo Chen and Ying Wu Phys. Rev. Applied 5, 054021 (2016)
[10] Jun Mei, Ying Wu, C. T. Chan, and Zhao-Qing Zhang Phys. Rev. B 86, 035141 (2012)
Anyone interested is welcome to attend.