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Multifunctional metasurface optical device based on point light source irradiation and its design method

A metasurface and design method technology, applied in the field of micro-nano optics and optical holography, can solve the problems of limited geometric phase metasurface application, inability to change and generate holographic images, and inability to generate independent images, etc., to achieve high-efficiency effects

Active Publication Date: 2022-02-11
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, due to the fact that the geometric phase does not change with the wavelength and has opposite phase distributions under different circular polarization states, the outgoing fields under different incident conditions are correlated. , the holographic image is proportionally enlarged or reduced under different wavelengths of incidence, so it is impossible to generate an independent holographic image through changes in external conditions, which greatly limits the further application of geometric phase metasurfaces in multifunctional devices

Method used

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  • Multifunctional metasurface optical device based on point light source irradiation and its design method
  • Multifunctional metasurface optical device based on point light source irradiation and its design method
  • Multifunctional metasurface optical device based on point light source irradiation and its design method

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Embodiment 1

[0053] According to the method of the present invention, a metasurface optical device is designed, and the nanorods used in the metasurface optical device are silicon nanoblocks, and the length × width × height of the silicon nanoblocks is L350nm × W40nm × H150nm, and the silicon nanoblocks are repeated in a square The units are arranged, and the distance P between the centers of two adjacent silicon nanoblocks is 400nm. The scanning electron microscope of the metasurface is shown as Figure 4 As shown, a small hole with a diameter of 1 μm is used as a point light source, and the point light source is placed at the center of the metasurface with a vertical distance of d=100 μm x d = 0 μm, y d = 0μm, irradiate laser with a wavelength of 532nm, when the incident and detection polarization combinations are left-handed and right-handed, right-handed and left-handed, the detection results are as follows Figure 5 As shown, the metasurface holographic optical device shows "L" and "...

Embodiment 2

[0055] Adjust the incident and detection polarization combinations of embodiment 1 to be left-handed and right-handed, according to figure 1 The abscissa of the adjusted point light source in the coordinate system shown is x d =-50μm, 0μm, 50μm, the results are as follows Figure 6 The simulated, experimental images shown, by Figure 6 It can be seen that three independent expression images can be obtained by adjusting the position of the point light source.

Embodiment 3

[0057] Adjust the incident and detection polarization combinations of embodiment 1 to be left-handed and right-handed, and the incident wavelength of the point light source is λ=473nm, 532nm, 671nm and the three are incident simultaneously, as follows Figure 7 The shown simulation and experimental display images can realize independent holographic image display at different wavelengths.

[0058] Existing metasurface optical devices adopt plane wave incident, and the plane wave complex optical field irradiated on the metasurface structure has nothing to do with its wavelength, polarization and position to the metasurface, so that multiple holographic images displayed by the metasurface optical device are correlated, The independent display of multiple holographic images cannot be realized. The present invention uses a point light source as the incident light source. Since the optical path difference from the point light source to the metasurface depends on the polarization, wav...

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Abstract

The invention discloses a multifunctional metasurface optical device based on point light source irradiation and a design method thereof. The optical device includes a metasurface. The surface includes a dielectric substrate on which an anisotropic dielectric nanorod array is integrated. The nanorods are in the shape of a cuboid or ellipsoid. In the present invention, the optical path difference between the point light source and the metasurface depends on the wavelength, The characteristics of polarization and its relative position with the metasurface break the limitation of the correlation of holographic images generated by traditional plane wave incidence, and realize the independent display of multiple holographic images.

Description

technical field [0001] The invention belongs to the technical field of micro-nano optics and optical holography, and in particular relates to a multifunctional metasurface optical device based on point light source irradiation and a design method thereof. Background technique [0002] Metasurface is a layer of artificially designed micro-nano structure, which can flexibly control the amplitude, phase and polarization of the light field within the range of micro-nano scale. It is widely used in various fields of optics. In the design of various metasurfaces, geometric Due to the advantages of simple phase control and simple processing, the phase has attracted widespread attention. Under the incidence of circular polarization, the additional geometric phase of the metasurface is proportional to twice the rotation angle. This simple correspondence makes it independent of the specific The shape of the unit structure and the excitation wavelength have the advantages of broadband ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/32
CPCG02B5/32
Inventor 包燕军
Owner JINAN UNIVERSITY