Design and implementation method of super-structure surface rainbow system
A technology of metasurface and realization method, applied in the field of artificial rainbow, can solve the problems such as the inability to realize the rainbow arc shape, the large size of the device, and the lack of application of the design of the rainbow reproduction system.
Active Publication Date: 2020-11-17
SOUTH CHINA NORMAL UNIVERSITY
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Problems solved by technology
The linear focal line characteristic of traditional cylindrical lenses cannot realize the arc shape of the rainbow, and the device has limitations such as large volume and heavy weight.
Research exists on reflective metasurfaces or reflective metalenses, but has not been applied to the design of rainbow reproduction systems
Method used
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Embodiment 1
[0070] Such as figure 1 As shown, the present invention provides a design and implementation method of a metasurface rainbow system, comprising the following steps:
[0071] Step 1: Theoretical design of metasurface rainbow system
[0072] The design wavelength λ of the selected system d (such as the central wavelength of the studied white light spectrum), parallel light normal incidence conditions; the system includes a metasurface cylindrical lens primary mirror M 1 and metasurface reflective auxiliary mirror M 2 two coaxial elements, such as figure 2 .
[0073] 1. Design the phase distribution of the primary mirror of the metasurface cylindrical lens
[0074] Design of Alternative Metasurface Cylindrical Lens Primary Mirror M Based on Traditional Converging Cylindrical Lens Model 1 , size (L x , L 1y ), at z=z 1 =0 plane. at the design wavelength λ d The light is parallel and normally incident on M 1 On the surface, it can be converged in the x-z plane at the p...
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The invention discloses a design and implementation method of a super-structure surface rainbow system. The design and implementation method comprises the following steps: theoretically designing thesuper-structure surface rainbow system; selecting a design wavelength [lambda]d and a parallel light normal incidence condition of the system, wherein the system comprises a metasurface cylindrical lens primary mirror M1 and a metasurface reflection auxiliary mirror M2; completing the phase design of the two metasurface M1 and M2 under the condition of the designed wavelength lambda d; implementation of the rainbow function under white light irradiation: under a parallel light normal incidence condition, obtaining color spectrum distribution in a set form which is sequentially arranged according to a working wavelength sequence on an optical screen by utilizing dispersion characteristics of a meta-structure surface; and preparation of a super-structure surface rainbow system: preparing a super-structure surface cylindrical lens primary mirror and a super-structure surface reflection auxiliary mirror, aligning the two super-structure surfaces, and adjusting the distance between the twosuper-structure surfaces to be proper, thereby realizing focusing and imaging performance of the super-structure surface rainbow system. According to the invention, the stable display effect of the semicircular rainbow form in which the colored tapes are sequentially arranged according to the wavelength sequence is realized, and the rainbow effect of any spatial form can also be customized.
Description
technical field [0001] The invention relates to the technical field of artificial rainbows, in particular to a method for designing and implementing a metasurface rainbow system. Background technique [0002] The formation of natural rainbows is due to the refraction-reflection-refraction of sunlight through water-tight water droplets in the air and then being received by human eyes. There is dispersion in light of different wavelengths. When observed with the human eye as the center and the visual axis as the symmetric axis, the viewing angle corresponding to the maximum intensity of each color light changes monotonously with the wavelength. Since the viewing angle satisfies the rotational symmetry about the visual axis, each color light presents a specific cone angle distribution, so the natural rainbow is in a semi-circular arch state in principle; but limited by the weather, background light and other factors, usually only part of it appears Arc-shaped shape, the imagin...
Claims
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Login to View More IPC IPC(8): G02B27/00
CPCG02B27/0012
Inventor 欧阳敏朱衷正
Owner SOUTH CHINA NORMAL UNIVERSITY