報告題目：Topologically Protected Complete Polarization Conversion
報 告 人：Dr. Yu Guo（Stanford University）
Topological photonics has attracted great research interest owing to its potential to create photonic devices that are robust against small impurities and imperfections. In this talk, I will present our recent work on polarization conversion as light is reflected from a photonic crystal slab. We observe that complete conversion between linear polarizations can occur over a wide range of frequencies and further demonstrate that such an effect is topological in nature. We further show a photonic crystal slab can achieve arbitrary polarization conversion. Our work points to the use of topological photonics concepts for the control of polarization and suggests the exploration of topological properties of scattering matrices as a route towards creating robust optical devices.
Yu Guo, postdoctoral scholar at Ginzton Laboratory and Department of Electrical Engineering, Stanford University. He received his PhD in Electrical Engineering from Stanford University in 2019 and his Bachelor in Optical Science and Engineering from Zhejiang University in 2012. His research interest lies in theoretical and computational studies of nanophotonics, topological photonics, radiative heat transfer and Casimir force.