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On-chip directional rectification metasurface based on cascade nanometer microstructure and design method thereof

A microstructure and metasurface technology, applied in the field of micro-nano optics

Active Publication Date: 2021-09-14
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Zero-refractive-index materials can realize the function of light incident from any angle and emitted at an angle, but currently only supports the modulation of light in the infrared band

Method used

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  • On-chip directional rectification metasurface based on cascade nanometer microstructure and design method thereof
  • On-chip directional rectification metasurface based on cascade nanometer microstructure and design method thereof
  • On-chip directional rectification metasurface based on cascade nanometer microstructure and design method thereof

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Embodiment 1

[0033] This embodiment is a specific design process of an on-chip optical directional rectification metasurface.

[0034] As an example, first determine the rectifying metasurface as an on-chip metasurface, such as Figure 1-2 As shown, the semi-elliptical silver structure is used as the first layer of the rectifying structure, the isosceles trapezoidal silver structure is used as the second layer of the rectifying structure, silicon dioxide is used as an optical waveguide to propagate the light source in the visible light band, and the silver base layer is used to ensure Light does not leak in the -z direction as it propagates in the visible waveguide. The semi-elliptical silver structure with a period of 3.2 μm in the first layer can focus surface waves incident at different angles on the chip at a wavelength of 500 nm, where image 3 The wavefront shaping of surface waves by semielliptical silver structures is characterized. The second layer of isosceles trapezoidal silve...

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Abstract

The invention discloses an on-chip directional rectification metasurface based on a cascade nanometer microstructure and a design method thereof. The on-chip directional rectification metasurface with a directional rectification function can realize rectification of surface waves of a plurality of incident angles (within + / -20 degrees), so that the surface waves are transmitted and propagated along a normal direction (0 degree), and the performance similar to that of a zero refractive index material is formed. The on-chip rectification metasurface is composed of a silver substrate layer, a silicon dioxide waveguide layer and a semi-oval and isosceles trapezoid silver nanostructure layer. A semi-oval structure and an isosceles trapezoid structure achieve surface wave control through surface plasma resonance generated through interaction and phase gradient induced by the surface plasma resonance. The specific method for designing the on-chip rectification metasurface comprises the steps that the size of the semi-oval structure, the size of the large side and the size of the small side of the isosceles trapezoid structure and the distance between the semi-oval layer and the isosceles trapezoid layer are optimized at the same time, so that the rectification function is achieved under the oblique incidence angle as large as possible.

Description

technical field [0001] The invention belongs to the field of micro-nano optics technology, in particular to an on-chip directional rectification metasurface based on cascaded nano-microstructures and a design method thereof. Background technique [0002] In recent years, increasing attention has been paid to a type of metasurface that can manipulate light in a new degree of freedom, the on-chip (2D) metasurface. On-chip 2D metasurfaces create a new degree of freedom for optical manipulation, which can easily realize many functions that are difficult to realize on complex three-dimensional (3D) metasurfaces. Recent developments and advances in the interaction of light with on-chip 2D metasurfaces can enable many novel on-chip functions and applications, including on-chip metalenses, on-chip beam steering, mode multiplexing, demultiplexing, mode converters, Airy beams, Diffraction-free propagation, etc. Utilizing the spatial variation of the phase shift induced by subwavelen...

Claims

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Application Information

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IPC IPC(8): G02B5/00G02B1/00G02B27/00B82Y20/00
CPCG02B5/00G02B1/002G02B27/0012B82Y20/00
Inventor 李仲阳杨睿时阳阳万帅王泽静郑国兴李子乐
Owner WUHAN UNIV