A method for surface holography based on ω-shaped conformal metasurfaces

Abstract

The invention discloses a method for achieving curved surface holography based on a [omega]-shaped conformal metasurface, and belongs to the technical field of micro-nano optics and holography. The implementation method comprises the following steps of: firstly, accurately designing a metasurface unit structure, wherein the metasurface is formed by [omega]-shaped gold nano antennas, the rotation angles of the [omega]-shaped gold nano antennas are changed to allow the metasurface to perform any regulation and control of the phase of an emitted light beam; secondarily, adopting a FDTD (Finite-Different Time-Domain) to calculate an original curved surface [Phi]o and achieve phase distribution [Phi]d of the curved surface holography, wherein the phase distribution of the conformal metasurfaceis equal to the phase difference [Phi]p of the phase distribution of the curved surface and the phase distribution of the curved surface holography; and based on the berry phase principle, performingencoding of the phases by adopting the [omega]-shaped gold nano antennas with the same structure and different rotation angles according to the obtained phase distribution [Phi]p so as to achieve theeffect of the curved surface holography. The corresponding wave front modulation is achieved based on the [omega]-shaped conformal metasurface, and the method for achieving curved surface holography based on the [omega]-shaped conformal metasurface is applied to photoelectric devices in any shapes. The method for achieving curved surface holography based on the [omega]-shaped conformal metasurfacecan be used for spatial multiplexing of holographic images and improves the storage capacity of information.

Description

technical field [0001] The invention relates to a method for realizing curved surface holography by modulating the wavefront of an arbitrary curved surface object based on an Ω-type conformal metasurface, and belongs to the field of micro-nano optics and holographic technology. Background technique [0002] Metasurfaces are composed of periodic, quasi-periodic, or randomly distributed subwavelength nanoantennas that locally modify the amplitude, phase, and polarization of electromagnetic waves. By precisely designing the geometric parameters and azimuth angles of each metasurface unit in the array, the metasurface modulates the wavefront of the incident light to achieve some specific functions. In addition, compared with many conventional optical components, metasurfaces have subwavelength feature sizes, and thus have the advantages of ultrathinness, flexibility, and ease of fabrication. Due to the unique optical properties of metasurfaces, a wide range of applications have...

AI Technical Summary

Problems solved by technology

However, in the optical range, these design theories are very complicated, and there are certain challenges for the processing of such conformal metasurfaces.

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