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Multifunctional super-structure surface optical device based on point light source irradiation and design method thereof

A metasurface and point light source 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: 2020-11-20
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 super-structure surface optical device based on point light source irradiation and design method thereof
  • Multifunctional super-structure surface optical device based on point light source irradiation and design method thereof
  • Multifunctional super-structure surface optical device based on point light source irradiation and design method thereof

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Embodiment 1

[0053] The metasurface optical device is designed according to the method of the present invention. The nanorod used in the metasurface optical device is a silicon nanoblock. The length×width×height of the silicon nanoblock is L350nm×W40nm×H150nm, and the silicon nanoblock is repeated in a square The unit arrangement, the center-to-center distance P of two adjacent silicon nano-blocks is 400nm, the scanning electron microscope of the meta-surface is like Figure 4 As shown, a small hole with a diameter of 1μm is used as a point light source, and the point light source is placed at the exact center of the metasurface at a vertical distance of d=100μm x d =0μm, y d =0μm, irradiating a laser with a wavelength of 532nm, when the incident and detection polarization combinations are left-handed and right-handed, and right-handed and left-handed, the detection results are as follows Figure 5 As shown, the meta-surface holographic optical device shows "L" and "R" respectively, indicating...

Embodiment 2

[0055] Adjust the incident and detection polarization combination of Example 1 to a left-handed and right-handed combination, according to figure 1 The abscissa of the coordinate system shown to adjust the point light source is x d =-50μm, 0μm, 50μm, we get as Image 6 The simulated and experimental images shown are provided by Image 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 polarization combination of the incident and detection of Example 1 to the left-handed and right-handed combination, the incident wavelength of the point light source is λ=473nm, 532nm, 671nm and the three are incident at the same time, to obtain the following Figure 7 The simulation and experimental display images shown can realize independent holographic image display under different wavelengths.

[0058] The existing metasurface optical device adopts plane wave incidence, and the plane wave complex light field irradiated on the metasurface structure is independent of its wavelength, polarization and position on the metasurface, so that multiple holographic images displayed by the metasurface optical device are correlated. It is impossible to realize independent display of multiple holographic images. 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 de...

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Abstract

The invention discloses a multifunctional super-structure surface optical device based on point light source irradiation and a design method thereof. The optical device comprises a meta-structure surface. A point light source is arranged at a certain vertical distance on the side of the meta-structure surface; the meta-structure surface comprises a dielectric substrate, wherein an anisotropic dielectric nanorod array is integrated on the dielectric substrate, and the nanorods are cuboid or ellipsoid. The characteristic that the optical path difference between the point light source and the super-structure surface depends on the wavelength and polarization of the point light source and the relative position of the point light source and the super-structure surface is utilized, the limitation that holographic images generated by traditional plane wave incidence are associated with one another is broken through, and independent display of the multiple holographic images is achieved.

Description

Technical field [0001] The invention belongs to the technical field of micro-nano optics and optical holography, and particularly relates to a multifunctional superstructure surface optical device based on point light source illumination and a design method thereof. Background technique [0002] The metasurface is a layer of artificially designed micro-nano structures that can flexibly control the amplitude, phase and polarization of the light field within the micro-nano scale. It is widely used in various fields of optics. In the design of various meta-surfaces, geometric Because the phase has the advantages of simple phase control and simple processing process, people have received extensive attention. The additional geometric phase of the metasurface under the incidence of circular polarization is proportional to the double of the rotation angle. This simple correspondence makes it independent of specific The unit structure shape and excitation wavelength have the advantages o...

Claims

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Application Information

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IPC IPC(8): G02B5/32
CPCG02B5/32
Inventor 包燕军
Owner JINAN UNIVERSITY