Photoinduced transformations and holographic recording in nanolayered a-Se/As2S3 and AsSe/As2S3 films

Photoinduced structural transformations in nano-layered, compositionally mo dulated films of light-sensitive chalcogenide vitreous semiconductors (ChVS ), were investigated by holographic diffraction gratings (HDG) recording. T he essential role of surface deformation (expansion up to 5% in illuminated regions) at hologram recording in such structures is established. The surf ace relief, optical parameters, and diffraction-efficiency dependence on th e recording mechanism and film structure are examined, taking into account the possible effects of mutually additive or exclusive components of light modulation in reflection or transmission measurement modes.