题　目：Surface Plasmon Resonance in Super-Periodic Metal Nanostructures
报告人：Dr. Guo Junpeng （University of Alabama in Huntsville）
时　间：5月21日(周一), 上午10:00
地　点：物理馆512会议室

Abstract：
Surface plasmon resonances in periodic metal nanostructures such as metal nanoslit and nanohole arrays have been extensively investigated in the past decade. It is well-known that such periodic metal nanostructures support coherent surface plasmon resonance modes. The resonance wavelengths of these surface plasmon resonance modes are primarily controlled by the period and geometry of the metal nanostructures. By creating defects in regular periodic metal structures, super-periodic nanostructures can be created. In the super-periodic metal nanostructure, there are two periods: a small subwavelength period that controls the surface plasmon resonance and a large super-period that coherently radiates local surface plasmon polaritons to higher order diffractions. In this lecture, I will take super-period metal nanoslits and super-period nanoholes as the examples, to illustrate that surface plasmon resonances in super-period metal nanostructures can also be exhibited and measured in the diffraction orders. Being able to measure the surface plasmon resonances in high diffraction orders opens a new avenue for surface plasmon resonance spectroscopy.

Biography：
Guo Junpenggraduated with a B. S. degree and a M.S. degree from Peking University. Later, he received a Ph.D. in Electrical Engineering and a M.S. degree in Nuclear Engineering from the University of Illinois at Urbana-Champaign (UIUC). After graduating from UIUC, he started to work as a Research Scientist with former Rockwell International Science Center in Thousand Oaks, California and later with Sandia National Laboratories in Albuquerque, New Mexico. He has made numerous contributions to photonics and optics. Most notably, he demonstrated the first high-resolution thin film micropolarizer array device, which has made 3D TV displays possible. Dr. Guo is currently Associate Professor of Electrical Engineering and Optical Science and Engineering at the University of Alabama in Huntsville. He and his students are currently working on novel nanostructure plasmonics, nanophotonics, and metamaterials. Dr. Guo was a sole recipient of the Outstanding Junior Faculty Award in the College of Engineering of University of Alabama in Huntsville in 2007. He is a senior member of OSA and SPIE.