New composite material made from porous silica glass as low refractive index matrix and As2S3 chalcogenide glass in form of high refractive index nanoparticles filled in these pores is created and investigated as functional material for photonic applications. The fabrication method is based on preparation of chalcogenide nanoparticles in solvent and impregnation of porous glass matrix followed by heat treatment. Functionality of such materials is provided by size-limited chalcogenide material, which possesses variable optical parameters (absorption, refractive index) based on reversible optical and structural transformations under active illumination or heat treatment in such chalcogenide-containing composite. These are compared with effects in simple As2S3 layers: the photodarkening- bleaching or erasing the optically recorded image can be repeated multiple times enabling reversibility of amplitude-phase optical relief as part of 3D element like optical waveguides, coupling elements.
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