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Design method of amplitude-type supersurface computer-generated hologram for eliminating zero-order light

A technology of computational holography and design methods, applied in the direction of instruments, etc., can solve the problems of affecting the imaging quality of reconstructed images, interfering with the observation of reconstructed images, etc., and achieve the effect of light weight, good elimination of zero level, and improvement of image quality

Inactive Publication Date: 2020-02-14
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional holography has strong zero-order light, which greatly affects the imaging quality of the reconstructed image and interferes with the observation of the reconstructed image.

Method used

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  • Design method of amplitude-type supersurface computer-generated hologram for eliminating zero-order light
  • Design method of amplitude-type supersurface computer-generated hologram for eliminating zero-order light
  • Design method of amplitude-type supersurface computer-generated hologram for eliminating zero-order light

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Embodiment 1

[0055] Embodiment 1: [nano brick polarizer]

[0056]In view of the defects existing in the application of traditional holography, the present invention proposes a metasurface-based amplitude-type computational holographic zero-order image elimination method. The invention will be described in more detail below in conjunction with this embodiment:

[0057] The metasurface array includes multiple metasurface unit structures, and the structure diagram of the metasurface array is as follows figure 1 shown. All the nano-brick units have the same geometric size, only the rotation angle is different; the center intervals of the adjacent nano-brick unit structures are all the same. The schematic diagram of the metasurface unit structure is shown in figure 2 shown. Depend on figure 2 It can be seen that the metasurface unit structure includes a substrate 2 and nano bricks 1 deposited on the substrate. The nano-brick 1 and the substrate 2 constitute a nano-brick unit structure. ...

Embodiment 2

[0067] Example 2: [nano-brick half-wave plate]

[0068] The schematic diagram of the unit structure of the nanobrick half-wave plate is also shown in figure 2 shown. Taking the working wavelength λ=633nm as an example, the electromagnetic simulation software is used for modeling and simulation, and the circularly polarized light is vertically incident on the nano-bricks, and the structural parameters of the nano-units are scanned under the working wavelength, including L, W, H, C, and the transmission cross High polarization efficiency and low isotropic polarization efficiency for transmission are the optimization goals. The parameters of the preferably obtained first nano-brick structural unit are: L=150nm, W=60nm, H=385nm, C=300nm. Under this structural parameter, the transmittance forward polarization conversion efficiency and the transmittance reverse polarization conversion efficiency of nanobricks are as follows: Figure 7 shown. Among them, T_Cross is the transmiss...

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Abstract

The invention discloses a design method of amplitude-type supersurface computer-generated hologram for eliminating zero-order light. By constructing a new amplitude distribution function, the zero-order image of amplitude-type computer generated holography is eliminated by means of the amplitude regulation characteristics of super-surface nano-bricks, so that a clear, zero-order-free reconstructedimage with higher imaging quality is obtained. The invention can be applied to the fields of high-end anti-counterfeiting, image display and the like.

Description

technical field [0001] The invention relates to the technical field of micro-nano optics and image display, in particular to a design method of an amplitude-type metasurface computing hologram that eliminates zero-order light. Background technique [0002] Ordinary photography is based on the principle of geometric optics imaging, records the intensity of light waves, and images space objects on a plane. Due to the loss of the phase of light waves, the three-dimensional information of the object is lost. Optical holography uses the principle of interference to record the light waves emitted by the object in the form of interference fringes. Since the amplitude and phase information of the object light waves are stored in the recording medium, a realistic three-dimensional image of the original object can be formed. However, traditional holography has strong zero-order light, which greatly affects the imaging quality of the reconstructed image and interferes with the observat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03H1/00G03H1/04G03H1/08G03H1/32
CPCG03H1/0005G03H1/0443G03H1/0808G03H1/32
Inventor 李子乐郑国兴邓娟单欣李仲阳
Owner WUHAN UNIV
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