Abstract
In this work, light-extraction enhancement induced by localized surface plasmons (LSPs) on asymmetrical design of metallic nanoparticles (NPs) for AlGaN deep-ultraviolet (UV) light-emitting diodes (LEDs) is investigated numerically. The systems under study consist of Al NPs with varying diameter separated by a nano-gap, and the symmetrical dimer NPs with different geometrical parameters are studied for reference. We have demonstrated that tunable plasmonic NPs and spectral response can be controlled by varying the size of the nanoparticles and nano-gaps. It is found that the enhancement of the electric field and the peak position are subject to geometrical characteristics of the NP components in different manners for symmetrical and asymmetrical systems, respectively. High enhancement ratio for UV wavelength can be obtained by tuning parameters of asymmetrical system, which is potential for improving the performance of deep-UV LEDs.
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