Study on the optoelectronic properties of Ag, Pt, Na and Li particles adsorbed on GaAs nanowire arrays

In this paper, COMSOL Multiphysics software based on finite element method was used to design a GaAs nanowire array simulation model absorbed with metal nanoparticles. We studied the effects of the size, position and number of metal nanoparticles on their light absorption, and in this experiment, precious metal (Ag, Pt) and alkali metal (Na, Li) particles adsorbed on nanowires. The results show that the adsorption of metal particles is helpful to improve the light binding capacity of short wavelength nanowire arrays. With the change of the radius, position and number of particles, the nanowires absorbed by Li and Ag nanoparticles showed better light absorption characteristics. The optical trapping effect can be effectively enhanced by increasing the size of particles, the number of surrounding particles and the number of particles which distributed along the nanowire direction appropriately.