Tunable optical force on a perovskite-coated gold nanosphere by a polarized Bessel beam

Abstract

The optical force on a perovskite-coated gold nanosphere by a polarized Bessel beam is investigated in the generalized Lorenz-Mie theory (GLMT) framework. The dielectric function of the gold core is described using the Drude-Sommerfeld model, and the cesium silver bismuth bromide (CABB) is considered for the coating. The axial optical forces F z are numerically calculated. The effects of both beam parameters (half-cone angle α0, order l, polarization) and the thickness of the coating are discussed. Numerical results show that the optical force peaks can be adjusted by changing the thickness of the coating. However, the half-cone angle α0 and order l can only change the magnitude of the optical force. The optical force can be tuned by changing beam parameters (α0, l), and the coating thickness of particles. The obtained results demonstrate potential applications for the trapped perovskite gold nanosphere.