SPECTRAL FILTER PASSE BAND WITH HIGH SELECTIVITY AND CONTROLLED POLARIZATION

摘要

According to one aspect, the invention relates to a band pass spectral filter, optimized for transmission of an incident wave to at least a first central wavelength λ given comprising: a metal network of thickness (t) greater than about λ / 50 and comprising at least a first set of substantially identical, parallel slots of width (w) less than approximately λ / 10, spaced periodically or quasi-periodically in a first period less than said first central wavelength, a layer of dielectric material of given refractive index (n), coupled with the metal network to form a waveguide of the waves diffracted by the grating, said first period of the grating being adapted so that only the orders 0 and 1 d a normal incidence wave and wavelength λ are diffracted in the layer of dielectric material, the entire dielectric layer and network being suspended.