A route to ultra-fast amplitude-only spatial light modulation using chalcogenide phase-change materials

https://phys.org/news/2023-08-route-ultra-fast-amplitude-only-spatial-modulation.html

"GeTe layer mirror-like changing between amorphous and crystalline states, reflected light gradual discrete amplitude change becomes accessible without modifying optical phase... increase degrees freedom wave front shaping combining with their phase-only counter-parts based on liquid crystals... absolute intensity modulation 38% (relative modulation of 233%), optical phase shift <≈π/50... transition rates ns or less... non-volatile and  energy-efficient... pixelated devices,  communications, detection and grayscale imaging"

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