Patent ID: 9588339
Date: 2017-03-07
CPC Classifications: B82Y,G01J,G02B

Claim:
1. A device for controlling the phase of an incident optical wavefront having a wavelength in a given spectral band of use, comprising: a substrate that is at least partially transparent in said spectral band and a set of blades arranged substantially at right angles to the surface of the substrate, wherein: said set of blades comprises an alternation of juxtaposed blades, respectively made of metal material, of a first dielectric material and of at least one second dielectric material different from the first dielectric material, so as to form juxtaposed metal-multidielectric-metal (MmultiDM) structures, of sub-wavelength widths, each structure forming a cavity exhibiting one or more propagation modes, and the respective thicknesses of the blades made of a first dielectric material and of second dielectric material(s) are adjusted in each of said MmultiDM structures to induce a local shift of the phase of the wavefront, the local phase shift being dependent on the effective index of the mode or modes able to be propagated in said cavity.