Electro-optic wavelength filtering device for plasmon waveguides based on ordered arrays of Au nanorings

Abstract

Three-dimensional numerical modeling of a controlled plasmonic filtering device based on Au nanorings in an SiO2 host has been investigated. It is shown that a certain plasmon waveguide based on an ordered array of Au nanorings which utilized as a waveguide ring resonator (WRR) can be used to control the propagated optical energy and also to control energy transmission through the waveguide. In addition, the quality of switching and transmission efficiency of guided light at desired wavelength (λ≈1550nm) has examined. It is demonstrated that employed nanoparticles are sensitive to operating wavelength spectrum and provide high accuracy in filtering and switching processes. Calculations show that the transmitted power along the waveguide while passing through the output port is approximately 92% and on the contrary the power flow for filtered wavelengths is obtained as 2.4% that related to energy escaping at output port.