Activation of the polyvalent functionality for the optical filters using metamaterials

Abstract

A multifunctional filtering structure has been obtained, where the filter character can be changed by redirecting the propagating wave through one path of the module or another. A metamaterial with constituents of tens to hundreds of nanometers for filtering in visible and infrared range was used, where commutation was done by interchanging the module pins of the filter connected to a multimode optical fiber. Metamaterial structure was synthesized using simulation methods with HFSS. Structure was reproduced at nanoscopic level in order to model the resonant propagation phenomena of the plasmons. Metal / dielectric constituents have been considered, in complementary geometrical configurations. The S parameters at the field propagation have been obtained in a range of 400 – 1000 nm. Different domains of their evolution in function of wavelength can be extended by adjusting the geometrical parameters of the structure. The optimal geometry for a specific filtering effect (broadband / narrow band / stop band) was set. The Drude-Lorentz model was used to calculate the resonant frequency of the filter with periodic spatial structure. A more reliable model for the real sample has been exploited for simulations