Affiliation:
1. Xi’an Jiaotong University
Abstract
We propose the coupling of multiple quantum wells and surface plasmons can improve coherence of light emitted from LED wafers, as evidenced herein by a shallow-etched conic pit array with evaporated Ag (V-Ag) on a GaN-based LED wafer. The improvement in spatial coherence is critically verified by angle-resolved spectra. The temporal coherence length of the V-Ag wafer is 1.4 times larger than that of the plain wafer. The coherence-enhanced wafer achieves anisotropic and deflective emission in micro area and at far field by diffraction. This research provides a novel perspective on research of plasmonic LEDs and a new straightforward architecture to acquire partially coherent light from LEDs.
Funder
Fundamental Research Funds for the Central Universities
National Natural Science Foundation of China
Postdoctoral Research Foundation of China
Natural Science Foundation of Shaanxi Province
Subject
Atomic and Molecular Physics, and Optics