Abstract
In this article, we numerically studied the optical response characteristics of GaN/AlGaN nanowire arrays decorated with metallic nanoparticles. Based on the finite element simulation software COMSOL Multiphysics, we systematically studied the influence of the size and material of nanoparticles, diameter and period ratio (D∕P ratio) and angle of incident light (AOI) on the optical response in the incident light wavelength range of 200–400 nm. Decorated with gold and silver nanoparticles, we discussed the absorption efficiency, electric field distribution and absorption enhancement of plasmonics AlxGa1−xN nanowire arrays (NWAs). The calculation results show that the resonance absorption effect is usually related to the structure and size of the metallic nanoparticles. By optimizing the material and geometric parameters of AlGaN NWs and metal balls with varying Al composition, double-layered AlxGa1−xN nanostructure decorated with Ag NPs – the bottom layer of which consisted of Al0.35Ga0.65N and the top layer of GaN – showed enhanced efficiency. The calculation results from this article will provide a valuable reference for the theoretical and experimental research of plasmonic AlxGa1−xN NWAs photocathode.
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