Pure-phase high-resolution spatial light modulator with 4 pi modulation range

Abstract

The invention discloses a pure-phase high-resolution spatial light modulator in a 4-pi modulation range. The pure-phase high-resolution spatial light modulator mainly comprises two resonance type metasurfaces, a liquid crystal medium environment, an electrode layer, a reflecting layer and the like, wherein the resonance type metasurfaces are oppositely arranged and are composed of dielectric medium sub-wavelength unit structures and substrates. Based on the characteristic that the resonance spectrum of the metasurface can be adjusted by changing electromagnetic parameters of an external environment, the Huygens metasurface is combined with liquid crystal, and light wave phase point-by-point continuous dynamic modulation under the sub-wavelength pixel scale is achieved. In addition, due to the design of introducing the laminated metasurface and the reflecting layer, the total phase modulation depth can reach 4 pi, and extremely high working efficiency can be kept. Compared with the existing pure-phase spatial light modulator technology, the device provided by the invention effectively improves the resolution and dynamic range of the device, is wider in application scene, is smaller in size, is lighter in weight, and is easier to integrate.

Description

technical field [0001] The invention relates to the field of micro-nano optics technology, in particular to a 4π modulation range pure phase high-resolution spatial light modulator. Background technique [0002] The phase modulation of the incident light wave by the traditional liquid crystal spatial light modulator is mostly based on the phase accumulation of the light wave in a medium with a certain thickness. When the refractive index of the liquid crystal is changed by applying an external voltage, the phase of the beam accumulation will change accordingly, achieving dynamic adjustment. Effect. In order to provide a sufficient 2π phase modulation range, the liquid crystal spatial light modulator often needs a certain thickness. If it is necessary to achieve a phase depth modulation greater than 2π, the longitudinal dimension of the device will be further expanded, which not only increases the volume and weight of the device, but also This limits the further reduction of...

AI Technical Summary

Problems solved by technology

In order to provide a sufficient 2π phase modulation range, the liquid crystal spatial light modulator often needs a certain thickness. If it is necessary to achieve a phase depth modulation greater than 2π, the longitudinal dimension of the device will be further expanded, which not only increases the volume and weight of the device, but also It limits the further reduction of the pixel unit size, which is not conducive to the development of active optical devices towards ultra-thin, miniaturized and integrated

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