Coherent and tunable optical holography

Abstract

The invention relates to coherent and tunable optical holography. The coherent and tunable optical holography comprises coherent control of an incident polarization state and optical holography of a metamaterial code, wherein polarization standing wave coherent control is incident to the polarization state of a metasurface to dynamically display holographic images under different polarization states, a polarization standing wave is formed by two incident waves which are propagated in opposite directions and of which the polarization states are orthogonal in an interference way, the polarization state incident to the metamaterial is controlled dependent on phase difference, the metamaterial is a structure comprising a substrate and a nanometer unit layer, phase information of an object is coded by changing space distribution of the nanometer unit, so that a phase holographic diagram of the object is formed. The holographic diagrams displayed when light in different polarization states is incident to the metamaterial are different to obtain polarization identification and reproduction of optical holographic images, and dynamic change of the optical holographic images during gradual changing process of the polarization states of the incident light is achieved.

Description

technical field [0001] The invention belongs to the fields of electromagnetic waves, holographic optics and electromagnetic metamaterials, and in particular relates to a coherent tunable optical hologram. Background technique [0002] Optical holography technology uses the principle of light interference and diffraction to record the specific light waves reflected by objects in the form of interference fringes, and then read the light wave information through certain technical conditions to form a three-dimensional image. The application of optical holography technology is quite extensive, including holographic interferometry, holographic storage, holographic optical devices, holographic microscopy, display holography, computational holography and so on. In the early holographic elements, because there were only two simple phase adjustment functions of 0 and π, it was difficult to improve the image signal-to-noise ratio, which caused great pressure on subsequent filtering an...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the existing technology can only image static and single incident polarized light, the present invention provides a coherent and tunable optical hologram that utilizes polarization standing waves to regulate the polarization state of incident light to realize dynamic control of optical holography. Simple, low cost, thin thickness, light weight, etc., with high practical value

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