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16 March 2015 Optimized plasmonic light emission enhancement in III-N quantum-well emitters
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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.
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Toufik Sadi, Jani Oksanen, and Jukka Tulkki "Optimized plasmonic light emission enhancement in III-N quantum-well emitters", Proc. SPIE 9357, Physics and Simulation of Optoelectronic Devices XXIII, 93570J (16 March 2015);

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