Metasurface color vector complex amplitude holographic element

Abstract

The invention discloses a super-surface color vector complex amplitude holographic element, which comprises a bimetallic nanorod unit structure with adjustable in-plane rotation angles and in-plane displacement, wherein an aluminum-silicon dioxide-aluminum super-structure grating structure generates a polarization-selective type diffraction efficiency enhancement effect in a visible light range; asum of in-plane displacement of two metal nanorods in the unit structure and diffraction phase information are in a linear modulation relationship, a difference between the rotation angles of the twometal nanorods and a diffraction light amplitude are in a sinusoidal modulation relationship, and a sum of the rotation angles of the two metal nanorods and a diffraction light polarization directionare in a linear modulation relationship; and a color holographic method is implemented on diffraction level by utilizing the phase displacement based on inherent dispersion of the super-structure grating. The super-surface color vector complex amplitude holographic element disclosed by the invention has the advantages of low requirements for preparation control precision, simple structure, high degree of control freedom and the like, and has powerful functions of simultaneously controlling four parameters of light wave phase, polarization, amplitude and frequency.

Description

technical field [0001] The invention relates to the technical field of optical holography, in particular to a color vector complex amplitude holographic element realized by using a metasurface platform. Background technique [0002] A metasurface is an ultrathin functional layer structure that can manipulate light fields at will by precisely controlling any degree of freedom of light. People have achieved a large number of light field modulation applications on the metasurface platform, and the typical ones include planar diffractive optical elements and planar polarization optical elements. The advantage is that they are more compact and lighter than traditional optical elements. By designing the scattering properties of individual metaatoms, metasurfaces can individually control the phase, amplitude, polarization, and frequency of light, so that some high-performance and compact nano-optical devices can be fabricated, such as high-efficiency metalens, broadband polarizatio...

AI Technical Summary

Problems solved by technology

However, it is still challenging to simultaneously control the four basic parameters of light amplitude, phase, polarization, and frequency through existing metasurface design principles, which hinders the further improvement of the function and performance of metasurface holographic elements.

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