OPTICAL DEVICE FOR SWITCHING PERIODIC PATTERN ON SURFACE OF AMORPHOUS THIN FILMS OF PHASE-VARIABLE CHALCOGENIDE MATERIALS Russian patent published in 2024 - IPC G02F1/00 

FIELD: optics.

SUBSTANCE: invention can be used for switching a periodic pattern on the surface of amorphous thin films of phase-variable chalcogenide materials. Essence of the invention consists in the fact that an optical device for switching a periodic pattern on the surface of amorphous thin films of phase-changing chalcogenide materials includes a resistive heating element—a microheater, wherein the microheater has a variable-width shape, at the edges of which the width has a maximum value of not more than 400 mcm, and as the distance from the edge to the center also begins to decrease in the central area, where a thin film of a phase-variable chalcogenide material with thickness of 10 to 100 nm and an area of not more than 0.01 mm², reaches its minimum value of not more than 250 mcm, wherein the width of the narrow region varies in proportion to the wide one.

EFFECT: providing the possibility of modulating an optical signal due to diffraction of light on a periodic pattern formed on the surface of phase-variable chalcogenide films using a beam of ultrashort laser pulses.

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