7 March 2014 Plasmonic enhancement and losses in light-emitting quantum-well structures incorporating metallic gratings
Author Affiliations +
The unique properties of surface plasmons (SPs) are expected to provide a great improvement of light extraction in light-emitting diodes (LEDs). Surface plasmon modes are characterized by a high local density of states, and if scattered by gratings, significantly high emission enhancement is achievable. We investigate the physical role of SPs in improving light extraction from GaN quantum-well (QW) light-emitting structures incorporating metallic grating, by using first-principle theory based on Maxwell's equations and fluctuational electrodynamics. We demonstrate how careful nano-engineering, specifically by choosing the right nano-grating period, can reduce absorption losses and provide optimal enhancement; in the investigated test geometries, light extraction is increased by a factor of four, with the plasmonic losses being reduced from ~ 90% to below ~ 60% thanks to the metallic grating. While the results confirm a strong enhancement and reduction in the plasmonic losses, the overall losses still represent a significant obstacle for plasmonic-enhanced emission. With further optimization of the structure, the grating shapes and the materials, a much larger enhancement and lower losses are expected to be possible.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Toufik Sadi, Toufik Sadi, Jani Oksanen, Jani Oksanen, Jukka Tulkki, Jukka Tulkki, "Plasmonic enhancement and losses in light-emitting quantum-well structures incorporating metallic gratings", Proc. SPIE 8980, Physics and Simulation of Optoelectronic Devices XXII, 89800Z (7 March 2014); doi: 10.1117/12.2038506; https://doi.org/10.1117/12.2038506

Back to Top