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Elliptical Airy vortex beam generator based on metasurface and beam generation method thereof

A technology of a vortex beam and a generating method, applied in the optical field, can solve the problems of inconvenient practical application, large equipment volume, complex structure, etc., and achieve the effects of simple design complexity, large focus depth, and simple device structure

Active Publication Date: 2022-06-07
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the application of Airy vortex beams, the traditional method of generating Airy vortex beams is generally completed by using spatial light modulators, but most of the existing spatial light modulators have complex structures and large equipment, which will give Inconvenience in practical application

Method used

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  • Elliptical Airy vortex beam generator based on metasurface and beam generation method thereof
  • Elliptical Airy vortex beam generator based on metasurface and beam generation method thereof
  • Elliptical Airy vortex beam generator based on metasurface and beam generation method thereof

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Embodiment

[0035] Example: based on the hypersurface of the oval Airy vortex beam generator, wherein: comprising a silica substrate, the substrate is composed of a plurality of substrate elements, each substrate unit is a horizontal section of a square column structure, the substrate is provided with a plurality of nanosels, nanosoles are matrix distribution, the length of the nanosuble is W x , the width of the nanostelast is W y The rotation angle of the nanolest is α, the structure of the nanopole is a cuboid structure, the lattice constant of the nanopole is P= 0.7 μm, the height of the nanopole is H = 0.8 μm; the rectangular nanodial length is set to W x = 0.24 μm, width W of nanoscillum y From 0.34 μm to 0.43 μm, and the rotation angle of the nanopole α is 0° to 180°.

[0036] The initial light field of the elliptic Airy vortex beam is sampled to determine the amplitude and phase at the width of the nano-column W y When the rotation angle of the nanolead changes from 0.34 μm to 0.43 μm...

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Abstract

The invention discloses an elliptical airy vortex beam generator based on a metasurface and a beam generation method thereof, the generator is provided with a silicon dioxide substrate, the substrate is provided with a plurality of nano-columns, the nano-columns are distributed in a matrix mode, the length of each nano-column is Wx, the width of each nano-column is Wy, and the rotation angle of each nano-column is alpha; the light beam generation method comprises the steps that the light beam generator generates an elliptical Airy vortex light beam under vertical incidence of circularly polarized light, and the polarization conversion rate and the transmissivity of a transmission light field are changed by controlling the geometric size and the rotation angle of the nano-column. According to the invention, a plurality of nano columns made of monocrystalline silicon are arranged on the silicon dioxide substrate to construct a metasurface device, and compared with a traditional spatial light modulator, the device is simple in structure, lighter in weight and smaller in size on the premise that complex light beams conforming to expectation can be generated, and convenience is brought to generation of the complex light beams in practical application.

Description

Technical field [0001] The present invention relates to the field of optical technology, particularly to an elliptical Airy vortex beam generator based on a metasurface and a beam generation method thereof. Background [0002] A vortex beam is a special beam with an isophasic plane spiral structure and carrying orbital angular momentum, and has also been greatly used in optical communication, particle rotation and detection. Airy beams are undiffracted beams of light propagating along curved paths in free space, and their amplitude intensity meets the parabolic trajectory of particles doing flat-thrown motion under the action of gravity. In addition, the Airy beam also has a self-healing property, if it is blocked in a certain position, after transmitting a certain distance, the occluded main valve can "grow" again, which can resist the damage of the external environment to it. The Airy Vortex beam belongs to the category of complex beams and has great application potential, amon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/00G02B5/30G02B27/09G02B27/00G02B27/28G02B1/00
CPCG02B5/00G02B5/30G02B27/0927G02B27/0938G02B27/0012G02B27/286G02B1/002
Inventor 徐弼军薛晓菊吴白瑞职佳浩陈丹丹陈远路
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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