Enhanced and Partially Polarized Output of a Light-emitting Diode with Its InGaN/GaN Quantum Well Coupled with Surface Plasmons on a Metal Grating
Journal
Applied Physics Letters
Journal Volume
93
Journal Issue
23
Date Issued
2008-12
Author(s)
Shen, Kun-Ching
Chen, Cheng-Yen
Chen, Hung-Lu
Huang, Chi-Feng
Abstract
The enhanced and partially polarized output of a green light-emitting diode (LED), in which its InGaN/GaN quantum well (QW) couples with surface plasmons (SPs) on a surface Ag grating structure, is demonstrated. Compared with a LED sample without (flat) Ag coating, the total output intensity of an LED of SP-QW coupling can be enhanced by ∼59% (∼200) % when the grating period and groove depth are 500 and 30 nm, respectively. Also, a bottom-emission polarization ratio of 1.7 can be obtained under the condition of 15 nm in groove depth. © 2008 American Institute of Physics.
Other Subjects
Current density; Light emission; Plasmons; Semiconductor quantum wells; Semiconductor quantum wires; Silver; Surface structure; Grating periods; Grating structures; Green lights; Groove depths; InGaN/GaN quantum wells; Light emitting diode leds; Metal gratings; Output intensities; Polarization ratios; Surface plasmons; Light emitting diodes
Type
journal article
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