报告邀请人：杭志宏

报告摘要：Photonic crystal slabs are two-dimensional periodic dielectric structures that exhibit band gaps for in-plane propagation while confine light in the third dimension. Inside the light cone, the modes guided in the photonic crystal slabs will interact with the modes of free space and become guided resonance modes. In this talk I will introduce some interesting functionalities of such guided resonance modes. This talk comprises two major parts. In the first part I will show that, by carefully engineering the dispersion of the guided resonance modes, we can perform image differentiation in the transmission side. This thus offers the possibility of high-throughput low-energy-consumption image operation with a compact device . In the second part, I will show that guided resonance modes also exhibit topological features. It can be utilized to achieve complete polarization conversion between the incident light and the outgoing light [2,3]. Interestingly, such an effect has a topological origin which guarantees it to be a broad band effect. Meanwhile, it can also exhibit fancy spin texture in the momentum space near a valley . 

C. Guo, M. Xiao, M. Minkov, Y. Shi, and S. Fan, Optica 5, 251 (2018).

Y. Guo, M. Xiao, and S. Fan, Phys. Rev. Lett. 119, 167401 (2017).

Y. Guo, M. Xiao, Y. Zhou, and S. Fan, ‎Adv. Opt. Mater 7, 1801453 (2019).

C. Guo, M. Xiao, Y. Guo, L. Yuan, and S. Fan, Phys. Rev. Lett. 124, 106103 (2020).

报告人简介：Meng XIAO is currently an assistant professor in Wuhan University. Before that, he was a postdoc working with Prof. Shanhui Fan in the electrical engineering department of Stanford University. He got his Ph. D. from the Hong Kong University of Science and Technology (Supervisor: Prof. C. T. Chan) and bachelor’s degree from Wuhan University. Dr. Xiao is now working on topics such as wave functional material, topological photonics and topological phononics.

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