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Polarization multi-channel metasurface optical element and method for reconstructing full-color holographic image

A metasurface and holographic image technology, which is applied in the fields of micro-nano optics and optical holography, can solve problems such as the inability to realize holographic image coding, and achieve the effects of simple structure, large field of view, and thin volume.

Active Publication Date: 2020-11-27
SHENZHEN LOCHN OPTICS TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, previous PB phase-based interleaved units or anisotropic structured surfaces have not fully explored the degrees of freedom of birefringent metasurface units, and cannot realize the encoding of holographic images with three independent polarization channels and high-efficiency multi-channel polarization multi- channel hologram

Method used

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  • Polarization multi-channel metasurface optical element and method for reconstructing full-color holographic image
  • Polarization multi-channel metasurface optical element and method for reconstructing full-color holographic image
  • Polarization multi-channel metasurface optical element and method for reconstructing full-color holographic image

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Embodiment 1

[0065] Consider two schemes for polarization-dependent multiplexing surfaces. First, if the metasurface unit is not rotated, the output electric field can be obtained under x- and y-polarized light, respectively. Thus, two independent phase profiles can be encoded into a single metasurface and switched by two orthogonal incident polarizations. Figure 6 It is the scanning electron microscope picture of the metasurface in embodiment 1, Figure 6 TiO is shown in Example 1 2 Top and oblique views of scanning electron microscope (SEM) images of the holographic metasurface scheme; Figure 7 It is the simulation figure and the optical characterization result figure of the metasurface in embodiment 1, such as Figure 7 As shown, two off-axis images of “HUNAN” and “UNIVERSITY” are encoded on the metasurface, demonstrating the functionality of the dual-channel holographic metasurface.

Embodiment 2

[0067] In order to take full advantage of the flexibility of the Jones matrix, three parameters of the nanopillars, including the rotation angle, are freely selected. Then the output electric field can include φ 1 , φ 2 and φ 3 Information. In x- and y-polarized light, the phase φ 1 , φ 2 and φ 3 is φ x , φ y and a function of θ. Figure 8 It is the scanning electron microscope picture of the metasurface in embodiment 2, Figure 8 shows the TiO of Example 2 2 Top and oblique views of scanning electron microscope (SEM) images of the holographic metasurface scheme. Figure 9 It is the simulation diagram and the optical characterization result diagram of the metasurface in embodiment 2, such as Figure 9 As shown, three off-axis images of "X", "Y" and "Z" are encoded on the metasurface, demonstrating the functionality of the three-channel holographic metasurface.

Embodiment 3

[0069] Since the proposed metasurface can support three independent polarization-related information and can be used in a certain wavelength range, the principle of three primary colors can be combined to realize polarization multi-channel full-color holography. Figure 10 is a schematic diagram of color holographic coding in Embodiment 3, Figure 10The polarization multi-channel color holographic metasurface generation process is shown. First, the target color image is divided into three three-color components corresponding to wavelengths of 633nm (R), 532nm (G) and 450nm (B). After that, the phase distribution corresponding to the image is obtained, which is then coupled into three independent polarization channels. Based on the phase distribution, the layout map corresponding to the metasurface formed by the structural parameters and orientation angles with the closest phase response is found. Color images of the information encoded by the 400 μm × 400 μm metasurface were ...

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Abstract

A polarization multi-channel metasurface optical element and a method for reconstructing a full color holographic image. The polarization multi-channel metasurface optical element consists of a dielectric substrate (1) and an anisotropic dielectric nanostructure array thereon, and achieves encoding of a holographic image for up to three independent polarization channels by means of adjusting the in-plane dimensions and the in-plane angles of nanostructures at various locations; in addition, the metasurface has the characteristic of wide band usage, and high efficiency multi-channel polarization multi-channel holography can be achieved at different wavebands by means of selecting different dielectric materials. By means of coupling three primary color components of a full color picture into three independent polarization channels of a visible light waveband polarization multi-channel metasurface, full color holographic displaying with near zero crosstalk can be achieved.

Description

technical field [0001] The invention relates to the fields of micro-nano optics and optical holography, in particular to a polarization multi-channel metasurface optical element and a method for reconstructing a full-color holographic image. Background technique [0002] Metasurfaces can allow people to adjust the phase, amplitude, and polarization of light waves arbitrarily in a two-dimensional plane, giving great freedom to design new optical components. Therefore, in recent years, lenses, light deflectors, polarization converters, and holographic metasurfaces based on metasurfaces have been proposed and widely studied. Among them, due to the characteristics of large field of view, high density, and high resolution, the holographic technology based on metasurfaces has attracted extensive attention. Strategies such as multi-angle, multi-angle, etc. are usually applied in multi-wavelength channels, such as color holography or multi-wavelength metalens. However, it is diffi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/28G03H1/26G03H1/00
CPCG02B27/28G03H1/0011G03H1/26G03H1/2645G03H2001/267
Inventor 胡跃强段辉高李苓罗栩豪李鑫马国斌徐晓波
Owner SHENZHEN LOCHN OPTICS TECH CO LTD
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