Manipulation of Polarization Rotation through Spherical Active Coated Nanoparticle Antenna at Optical Wavelength

Abstract

Manipulation of polarization has attracted more attentions in recent decades due to the inherent polarization sensitivity in optical regime. Many researchers showed that the interaction of light and surface plasmon may provide better opportunities to manipulate the polarization of light in optical regime by tackling with plasmonic material structures and their orientations. Here, we report a dielectric resonator attached to a spherical active coated nano particle antenna that rotates the polarization in active coated nano particle antenna in the direction parallel to the original plane wave propagation, i.e., polarization rotates by 90◦. In addition to this, the direction of scattered radiation also rotates by 90◦, i.e., scattered radiation propagates perpendicularly to the incident plane wave direction. The simulation results showed that the polarization rotation is observed only when the dielectric resonator and active coated nanoparticle antenna both resonates at similar frequency; here in this paper both dielectric and coated nano particle resonate near f o = 600 THz frequency. The comparison of electric field of single active coated nano particle and that of dielectric attached to active coated nano particle showed the enhancement of electric field from 3107 V/m to 4069 V/m. The far field pattern confirms the rotation of scattering radiations. The simulation results showed that the dielectric resonator has the capability to manipulate not only the polarization direction in spherical active coated nano particle antenna but can also rotate the plane wave direction at optical wavelength. These optical polarization and propagation rotation may provide promising opportunities in developing polarization manipulators, sensors and detectors at nanoscale.