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Zero level eliminated metasurface sinusoidal grating order and design method thereof

A technology of sinusoidal grating and design method, which is applied in the field of micro-nano optics, can solve the problems such as the inability to realize negative amplitude adjustment, and achieve the effects of high integration, light weight and small volume

Inactive Publication Date: 2020-04-14
WUHAN UNIV
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Problems solved by technology

However, the complex amplitude transmission coefficient of the current sinusoidal grating contains a constant part, so that the sinusoidal grating can only achieve positive amplitude adjustment, but cannot achieve negative amplitude adjustment, so the diffracted third-order spectral lines occupy a large part of the total energy. Part of the zero-order spectrum

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  • Zero level eliminated metasurface sinusoidal grating order and design method thereof
  • Zero level eliminated metasurface sinusoidal grating order and design method thereof
  • Zero level eliminated metasurface sinusoidal grating order and design method thereof

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] 1. Optimize the design of the nano-brick unit structure with the function of a half-wave plate.

[0027] In the following, the nano brick unit structure is a cuboid as an example for illustration. The length, width and height of the nano brick unit structure are all sub-wavelength.

[0028] Such as figure 1 As shown, the xyz rectangular coordinate system is established. The long side direction of the nano-brick unit structure represents the long axis, and the short side direction represents the short axis. Φ is the angle between the long axis of the nano-brick unit structure and the x-axis, that is, the nano-brick unit The orientation angle of the structure (Φ ranges from 0° to 180°), such as figure 1 shown.

[0029] The size parameters of the nano-brick unit structure are optimized by electromagnetic simulation software, i...

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Abstract

The invention discloses a zero level eliminated metasurface sinusoidal grating and a design method thereof. Firstly, a nano-brick unit structure capable of realizing a half-wave plate function is optimized, then a polarization state adjusting function of the nano-brick unit structure is utilized, incident linearly polarized light is subjected to polarization state modulation by changing a direction angle of a nano-brick, and continuous amplitude modulation can be realized by combining a polarization analyzer. The metasurface sinusoidal grating designed by the method not only can realize continuous amplitude modulation on the incident ray polarized light, but also can realize negative amplitude adjustment, and truly realizes amplitude modulation according to a cosine or sine function changerule. Because the complex amplitude transmission coefficient of the metasurface sinusoidal grating does not contain a constant term, only + / -1 level diffraction light exists during diffraction, no zero level exists, and the zero level eliminated sinusoidal grating is achieved.

Description

technical field [0001] The invention relates to the field of micro-nano optics technology, in particular to a zero-order-eliminating metasurface sinusoidal grating and a design method thereof. Background technique [0002] The sinusoidal amplitude grating can modulate the amplitude of the incident light wave according to the law of cosine or sine function without affecting its phase distribution. However, the complex amplitude transmission coefficient of the current sinusoidal grating contains a constant part, so that the sinusoidal grating can only achieve positive amplitude adjustment, but cannot achieve negative amplitude adjustment, so the diffracted third-order spectral lines occupy a large part of the total energy. Part of the zero-order spectrum. The zeroth order of a sinusoidal grating corresponds to the constant part of the grating’s complex amplitude transmission coefficient. From an information point of view, the zeroth order is often useless because it does not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/18G02B1/00G02B27/00
CPCG02B1/002G02B5/1866G02B27/0025G02B2005/1804
Inventor 郑国兴付娆李子乐单欣李仲阳
Owner WUHAN UNIV
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