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Proceedings Paper

Optimized plasmonic light emission enhancement in III-N quantum-well emitters
Author(s): Toufik Sadi; Jani Oksanen; Jukka Tulkki
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Paper Abstract

In recent years, experimental work has shown that significant luminescence enhancement can be obtained from quantum-well (QW) light-emitting diodes (LEDs) by using metallic grating, which diffracts efficiently optical modes and resonances trapped in these structures and converts surface plasmon (SP) modes into radiative modes. We employ a powerful simulation tool to provide a deep insight into the physics of plasmonic enhancement and present guidelines on how to optimize light-extraction in III-nitride LED structures incorporating an emitting InGaN QW located in the vicinity of a grated silver surface. The model uses first-principle theory, coupling the dyadic Green’s function formalism for solving Maxwell’s equations to fluctuational electrodynamics, and employs a recursive and transparent solution method allowing the fields to be written in a closed form. We demonstrate the significant effect of the type of the periodic grating and layer structure on light-extraction efficiency by simulating various structures with different grating shapes and dimensions. Careful optimization of the grating features shows that the maximum enhancement can reach a factor of around 8 as compared to the flat semiconductor structure and that the plasmonic losses can be significantly reduced.

Paper Details

Date Published: 16 March 2015
PDF: 8 pages
Proc. SPIE 9357, Physics and Simulation of Optoelectronic Devices XXIII, 93570J (16 March 2015); doi: 10.1117/12.2079044
Show Author Affiliations
Toufik Sadi, Univ. of Glasgow (United Kingdom)
Jani Oksanen, Aalto Univ. School of Science and Technology (Finland)
Jukka Tulkki, Aalto Univ. School of Science and Technology (Finland)

Published in SPIE Proceedings Vol. 9357:
Physics and Simulation of Optoelectronic Devices XXIII
Bernd Witzigmann; Marek Osiński; Fritz Henneberger; Yasuhiko Arakawa, Editor(s)

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