Center for Functional Nanomaterials Seminar
"Plasmon-Enhanced Semiconductor Light Emission"
Presented by Jeff DiMaria, Boston University
Friday, September 6, 2013, 10 am
CFN Bldg. 735 Conference Room A
Hosted by: Chuck Black
Center for Functional Nanomaterials Seminar Jeff DiMaria Plasmon-Enhanced Semiconductor Light Emission Boston University Department of Electrical and Computer Engineering Friday, September 6, 2013 10:00 a.m. Bldg. 735 â€" Conf. Rm. A InGaN alloys and related quantum structures are of great technological importance for the development of visible light emitting devices, motivated by a wide range of applications, particularly solid-state lighting. It is well known, however, that increasing In content causes a degradation of the internal quantum efficiency of these devices, which is dramatic for the green region of the spectrum and beyond. These limitations must be overcome before efficient solid-state lighting can be developed beyond the blue-green region with this material system. Recently, the application of surface plasmon polaritons (SPPs) supported by metallic nanostructures has emerged as a promising approach to address this issue through the enhancement of the spontaneous emission rate of emitters in the SPP near-field. In this talk, I will discuss my work addressing this issue, including a detailed study of the effect of height variations on the localized surface plasmon resonance of Ag nanocylinders, and the subsequent photoluminescence enhancement caused by the presence of these structures in the vicinity of InGaN multiple quantum wells. I will then discuss my work utilizing metal nanostructures to control the far-field profile of QW emission, including highly collimated surface-normal, and tunable off-normal unidirectional beam steering, towards potential applications in the area of solid-state "smart" lighting. interactions are possible. In this presentation, these principles will be demonstrated using the molecule sexiphenyl deposited on single crystal Cu surfaces