Function optimization of diffusive nanotriangles in random lasers

Abstract

The random laser has the potential to be replaced with the conventional cavity laser for abundant nanophotonics applications. For this purpose, it is essential to investigate the effect of using different materials as the diffusive medium in the random laser. We theoretically studied two groups of diffusive nanoparticles with some common materials used in the random lasers: metals (Au, Ag, Al) and dielectrics (TiO2, Si, GaAs). First, we compared the random lasing behavior with metal and dielectric triangle/sphere nanoparticles through the scattering cross section calculations. Then, the physical characteristics of triangle/sphere nanoparticles of both categories were investigated, resulting in the optimum scattering condition for the nanoparticles. Noteworthy, we have supposed that the triangle nanoparticles are made with colloidal lithography and randomly distributed in Rhodamine 6G as a gain medium for all simulations. We investigated that aluminum and titanium dioxide are good scatterers to interact with the gain medium over the photoluminescence emission spectrum. This study paves the way to design a more effective and applicable random laser for many potential applications.