EFFICIENT LIGHT EXTRACTION FROM WEAKLY-COUPLED DIELECTRIC BUTTES

摘要

A light emitting diode (LED) with weakly-coupled dielectric buttes deposited along the surface is disclosed. The buttes improve light extraction from a distributed volume of incoherent sources in a high-index substrate, as well as from light backscattered by a rear metallic contact. A lattice arrangement for the buttes maximizes area coverage, subject to the constraint of weak evanescent wave coupling between them. The butte distribution may be fabricated by epitaxial deposition above a current spreading layer, followed by photolithographic patterning and etching.

主权项

1. An optoelectronic device, comprising:
a substrate; at least one junction configured to provide an active region within the substrate; a metallic back contact; a collection of dielectric buttes disposed on a top surface of the substrate; and wherein the collection of dielectric buttes are spaced greater than approximately one and less than approximately three (1/e) decay lengths of an evanescent field that corresponds to waveguiding within a butte, over an operating wavelength range for the junction.