Polarized multi-channel metasurface optical element and method for reconstructing full-color holographic image
A metasurface and optical element technology, applied in the fields of polarized multi-channel metasurface optical elements and reconstruction of full-color holographic images, can solve problems such as inability to realize holographic image encoding, and achieve simple structure, super large viewing angle, and volume light effect
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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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