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On-chip directed rectifying metasurface and its design method based on cascaded nanostructures

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

Active Publication Date: 2022-05-17
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 directed rectifying metasurface and its design method based on cascaded nanostructures
  • On-chip directed rectifying metasurface and its design method based on cascaded nanostructures
  • On-chip directed rectifying metasurface and its design method based on cascaded nanostructures

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Experimental program
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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 cascaded nano-microstructure and a design method thereof. The on-chip metasurface with a directional rectification function can rectify surface waves at multiple incident angles (within ±20°), Make it transmit and propagate along the normal direction (0°), forming properties similar to zero-refractive-index materials. This on-chip rectifying metasurface consists of a silver substrate layer-silicon dioxide waveguide layer-semi-elliptical and isosceles trapezoidal silver nanostructure layers, and the surface plasmon resonance generated by the interaction of the semi-elliptical structure and the isosceles trapezoidal structure The induced phase gradient enables the manipulation of surface waves. The specific method for designing on-chip rectifying metasurfaces is: simultaneously optimize the size of the semi-elliptical structure, the size and size of the isosceles trapezoidal structure, and the distance between the semi-elliptical layer and the isosceles The rectification function is realized under the incident angle.

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 achieve 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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Patent Type & Authority Patents(China)
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