Special Colloquium
Department of Physics, NCU
Photonic Metasurfaces for Light Manipulation in Demand
Speaker
Dr. Pin Chieh Wu (吳品頡)
Department of Applied Physics and Materials Science, California Institute of Technology
Date 2018.01.9 (Tue)
Time 14:00
Place S4-625
Abstract: Photonic metamaterials composed of artificial structures have attracted a huge number of interests due to their extraordinary optical properties such as negative refractive index, optical invisibility, etc. Their single layer configuration, photonic metasurfaces, enable abrupt changes to the properties of electromagnetic wave like phase, amplitude as well as polarization within a subwavelength spatial region, which is very promising for the development of flat optics system. In this talk, I will firstly discuss the intriguing optical properties of unprecedented three dimensional vertical split-ring resonators (VSRRs) [1, 2], including plasmonic Fano resonance [3], toroidal dipolar response and non-radiating anapole mode [4]. Subsequently, the presentation will shift to the scheme of phase modulation through metasurfaces, which enables versatile polarization generations [5], high performance metalens [6], and achromatic metasurface devices [7, 8] at the visible for a wide range of applications. Furthermore, by incorporating metasurfaces with active materials/systems [9, 10], one can actively control the optical properties of meta-devices on demand like beam steering, and dynamic polarization conversion. Finally, I will discuss the future perspective of metasurface researches including, but not limited to, tunable achromatic meta-devices, plasmonic quantum gates, etc.