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Vector beam generation method based on spin decoupling super-surface wave band sheet

A production method and technology of zone plates, which are applied in instruments, polarizing elements, optics, etc., can solve the problems that cannot be realized in the terahertz band, the optical elements are cumbersome, and the processing difficulty and production cost are reduced, so as to achieve good beam focusing and reduce processing costs. Difficulty, cost saving effect

Pending Publication Date: 2022-07-01
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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Problems solved by technology

[0004] Aiming at the technical problem that the optical elements used in the existing vector beam generation method are bulky and cannot be realized in the terahertz band, the present invention proposes a vector beam generation method based on a spin-decoupled metasurface zone plate, which can operate in the terahertz band The generation of the focused vector beam is well realized, and the structure is simple, which significantly reduces the processing difficulty and saves the production cost

Method used

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  • Vector beam generation method based on spin decoupling super-surface wave band sheet
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  • Vector beam generation method based on spin decoupling super-surface wave band sheet

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Embodiment Construction

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] like figure 1 As shown, a method for generating vector beams based on spin-decoupled metasurface zone plates includes the following steps:

[0031] (1) The basic structure is designed to have the properties of a half-wave plate, so that the basic structure can only generate cross-polarized waves under the incidence of circularly polarized waves. The amplitudes of the same polarized waves generated by the basic structure under ...

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Abstract

The invention provides a vector wave beam generation method based on a spin decoupling super-surface wave band sheet, and the method comprises the following steps: designing a plurality of basic structures, and enabling the basic structures to only generate cross polarization waves under the incidence of circular polarization waves; dividing the super-surface wave band sheet into n concentric rings; arranging the designed basic structures according to a phase distribution rule to form a super-plane zone plate; a linear polarization incident wave is incident to a designed super-plane wave zone plate, and a focused vector light beam can be generated. According to the invention, cross polarization waves carrying specific topological charges can be generated under incidence of circular polarization waves. According to the invention, a focused vector light beam can be generated in a terahertz frequency band under the incidence of the linear polarized wave. According to the invention, good light beam focusing can be realized in a broadband range, and a good platform is provided for the imaging field. And the device is made of all-silicon materials, so that the processing difficulty is obviously reduced, and the manufacturing cost is saved.

Description

technical field [0001] The invention relates to the technical field of novel artificial electromagnetic materials and terahertz science, in particular to a method for generating vector beams based on spin decoupling metasurface zone plates. Background technique [0002] Polarization is an inherent property of electromagnetic waves, which characterizes the vibration of electromagnetic waves perpendicular to the direction of propagation. The polarization states of conventionally polarized light beams are considered to be uniformly distributed, including linear polarization, circular polarization, and elliptical polarization. In recent years, beams with non-uniform polarization characteristics have gradually attracted attention due to their unique optical properties, such as axisymmetric distribution of vector beams. Radial vector beams with stronger longitudinal field distributions carry more concentrated energy than uniformly polarized beams, suggesting that the beams can be...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/28G02B27/09G02B5/30G02B1/00
CPCG02B27/286G02B27/0938G02B5/3083G02B1/002
Inventor 姚建铨岳震李继涛李杰郑程龙张雅婷
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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