Optical system with a dielectric subwavelength structure having a high reflectivity and polarisation selectivity

摘要

System for transferring a beam of electromagnetic radiation having a vacuum wavelength, said system comprising a first and a second dielectric medium (1, 2) with respective first, second refractive indices n1, n2 and a dielectric layer (10) inbetween said first and said second medium, wherein said layer has a periodicity of the dielectric properties parallel to said layer, said periodicity having a period (λ) that is smaller than the wavelength of the electromagnetic radiation in said second dielectric medium (2), said dielectric properties and said periodicity (Λ) of said dielectric layer (10) further being chosen such that their parameter cooperatively establish that said beam () when incident on said dielectric layer (10) is reflected (ro) for essentially 100% into the specular zero-order reflection.