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Dolphin-shaped cell circle array metasurface

A metasurface and dolphin technology, applied in the field of optics and optoelectronics, can solve the problem of insufficient control of linearly polarized light, and achieve the effect of simple manufacturing

Inactive Publication Date: 2021-08-13
NANKAI UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing research results, there is still insufficient research on how to control linearly polarized light into a vortex beam.

Method used

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  • Dolphin-shaped cell circle array metasurface
  • Dolphin-shaped cell circle array metasurface
  • Dolphin-shaped cell circle array metasurface

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Embodiment 1

[0014] Such as figure 1 As shown, the dolphin-shaped cell circular array metasurface provided by the present invention is a circular array-shaped micro-nano metal structure, and a circular array is formed by a plurality of dolphin-shaped metal cell structures arranged in equiangular rotation, and the dolphin-shaped cell The central axis of the structure always points to the center of the circle array. The geometric structure of the dolphin-shaped metal cell is composed of two semi-crescent structures connected at cross-sections with opposite tips. The semi-crescent structure is obtained by intercepting two semi-cylindrical bodies. . The number of dolphin-shaped cells arranged on the circular array is N (N≥3 and N is a positive integer), and the connection line between the geometric center of the dolphin-shaped cell and the geometric center of the circular array divides the circle into N equal parts, and the structure of the dolphin-shaped cell The central axis always points t...

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Abstract

A novel dolphin-shaped cell circular array metasurface for generating local composite polarized light fields. The metasurface is a circular array-shaped micro-nano metal structure, which is composed of N (N≥3 and N is a positive integer) dolphin-shaped metal cell structures arranged in equiangular rotation to form a circular array. The dolphin-shaped metal cell binds the incident light energy to the surface of the structure, and finally generates a local focused strong field at the tip of each dolphin-shaped cell. Changing the structure factor m (m>1) can adjust the enhancement factor of the focus field; due to the dolphin Shaped metal cell itself and a circular array structure arranged at an equal angle, and can convert the incident linearly polarized light into a helical phase beam; the z-direction component of the transmitted light field E z The proportion of the intensity of the total light field E intensity decreases with the increase of the propagation distance, but with the increase of the propagation distance E z The better the phase spiral. The invention can be used as an optical tweezers and an optical angular momentum controller, and has important application value in the fields of broadband optical communication, optical imaging, nanometer manipulation and the like.

Description

technical field [0001] The invention belongs to the field of optics and optoelectronics technology, and relates to light field polarization modulation, nanometer manipulation, and surface plasmon excitation, in particular to a novel dolphin-shaped cellular circular array metasurface for generating local compound polarized light fields. Background technique [0002] When light passes through a structured material with subwavelength features, its propagation constant can depend on its polarization state, even if all its components are optically isotropic. At present, many kinds of subwavelength optical devices have been designed, which can control the polarization state of the light field, that is, the spin angular momentum. At the same time, the orbital angular momentum related to the space degree of freedom of the light field can also be adjusted. Orbital angular momentum has been identified as a useful degree of freedom to enhance the information-carrying capacity of photo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/28
CPCG02B27/286
Inventor 匡登峰杨卓
Owner NANKAI UNIV
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