DIFFRACTION GRATING Russian patent published in 2015 - IPC G02B5/18 

FIELD: physics.

SUBSTANCE: diffraction grating for the visible range comprises a substrate with a periodic diffraction microstructure embedded in the surface thereof, wherein elements of said microstructure are regions subjected to ion irradiation and are characterised by a different permittivity from the material of the substrate. The substrate is made of optically transparent dielectric or semiconductor material. The periodic diffraction microstructure comprises ion-synthesised metal nanoparticles dispersed in the surface region of the substrate on a layer thickness of 20 to 100 nm with metal concentration of 3·10²⁰-6·10²² atoms/cm³.

EFFECT: improved contrast and enabling use for both reflected and transmitted light.

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