By fabricating metal nanostructures on a light-emitting device for inducing surface plasmon (SP) coupling with the emitting quantum well (QW) of the device, its emission efficiency can be enhanced. In such an SP-QW coupling process, a few issues are important for understanding the coupling mechanism and hence improving the device design to achieve more efficient coupling effect. Such issues are to be discussed in this presentation. First, the energy flow scenarios in the coupling process are to be demonstrated. For instance, where does energy come from for increasing emitted power? Second, how is the SP resonance behavior of a metal nanostructure affected by the surrounding dielectric and metal structures? In particular, the surrounding metal structure of a different metal may reduce the SP resonance strength of a metal nanostructure. Third, how to differentiate the contributions of localized surface plasmon (LSP) and surface plasmon polariton (SPP) to an SP-QW coupling process? Which one can more effectively produce SP-coupling effect for enhancing emission efficiency? Fourth, what is the limit of the distance between a metal nanostructure and a QW for effective SP coupling? Such issues will be discussed in this presentation with experimental demonstrations and theoretical/numerical study results.

报告人简介：Professor Yang received his BS and Ph.D. degrees, both in electrical engineering, from National Taiwan University and University of Illinois at Urbana-Champaign, in 1976 and 1984, respectively. After nine year service as a faculty member at the Pennsylvania State University, he returned to Taiwan in 1993 and became a faculty member in the Institute of Photonics and Optoelectronics, and Department of Electrical Engineering, National Taiwan University, in which he is currently a distinguished professor. Professor Yang has published about 275 SCI journal papers and made more than 680 presentations at prestigious international conferences, including over 110 invited talks. His research areas include MBE and MOCVD growths of wide-band-gap semiconductor nanostructures, LED fabrication, plasmonics, and bio-photonics. Professor Yang is a fellow of Optical Society of America and a fellow of SPIE.