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Lens and Method for Generating Bessel Beams Carrying Orbital Angular Momentum Based on Metasurface

A technology of orbital angular momentum and metasurface, applied in the direction of electrical components, antennas, etc., can solve the problems of high processing precision, poor integration effect, and low energy utilization rate, and achieve high energy utilization rate, easy integration, and thin thickness Effect

Active Publication Date: 2018-09-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of high processing precision requirements, low energy utilization rate, and poor integration effect of the traditional Bessel beam generation method, thereby providing a lens based on metasurfaces that generate Bessel beams carrying orbital angular momentum and method

Method used

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  • Lens and Method for Generating Bessel Beams Carrying Orbital Angular Momentum Based on Metasurface
  • Lens and Method for Generating Bessel Beams Carrying Orbital Angular Momentum Based on Metasurface
  • Lens and Method for Generating Bessel Beams Carrying Orbital Angular Momentum Based on Metasurface

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specific Embodiment approach 1

[0027] Specific implementation mode one: combine figure 1 , figure 2 and Figure 5 to Figure 14 This embodiment is described in detail. The metasurface-based lens that generates a Bessel beam carrying orbital angular momentum described in this embodiment includes m×n periodically arranged phase mutation units, and both m and n are positive integers;

[0028] Each phase mutation unit includes a substrate 1 and a metal layer 2 located on the surface of the substrate. The metal layer includes two parts, one part is a square metal layer located in the center of the substrate 1, and the other part is a rectangular metal frame surrounding the square metal layer. Metal frame 1 There is a notch in the center of the opposite side of the group, with one side of the substrate as the x-axis, the angle between the center of the notch and the center of the substrate and the positive direction of the x-axis is θ,

[0029]

[0030] Wherein, x and y are respectively the abscissa and ordi...

specific Embodiment approach 2

[0046] Specific implementation mode two: combination image 3 Describe this embodiment in detail. This embodiment is to further illustrate the lens that generates a Bessel beam carrying orbital angular momentum based on the metasurface described in Embodiment 1. In this embodiment, the substrate 1 is a square with a side length of a, the side length of the square metal is 0.4a, the side length of the metal frame is 0.7a, the width is 0.06a, the length of the gap is 0.06a, and a is a positive number.

specific Embodiment approach 3

[0047] Embodiment 3: This embodiment is a further description of the lens that generates Bessel beams carrying orbital angular momentum based on the metasurface described in Embodiment 2. In this embodiment, both m and n are 35.

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Abstract

The invention discloses a lens and a method for generating Bessel beam carrying orbital angular momentum based on a super surface, relates to a technology for generating the Bessel beam carrying the orbital angular momentum and solves the problems of high processing precision requirement, low energy utilization rate and poor integration effect of the conventional method for generating the Bessel beam. The lens comprises m*n phase mutation units which are periodically arranged, wherein each phase mutation unit comprises a substrate and a metal layer located on the surface of the substrate; the metal layer comprises two parts, wherein one part is a square metal layer arranged at the center of the substrate and the other part is a rectangular metal frame surrounding the square metal layer; a notch is arranged at the center of each of one group of opposite sides of the metal frame; one side of the substrate is taken as an x axis, an inclined angle between the connecting line of the center of the notch and the center of the substrate and the forward direction of the x axis is theta, (formula), circular polarized wave is vertically incident, and the transmission cross polarization wave is the Bessel beam carrying the orbital angular momentum. The lens and the method are suitable for generating the Bessel beam carrying the orbital angular momentum.

Description

technical field [0001] The present invention relates to techniques for generating Bessel beams carrying orbital angular momentum. Background technique [0002] The non-diffraction beamforming characteristics of Bessel beams make it widely used in various optical systems, such as beam traction, near-field probes, lithography, optical data storage and other fields, with non-diffraction beamforming The combination of Bessel beam with propagation characteristics and orbital angular momentum, which can greatly improve the storage capacity of optical information, has gradually become a dark horse in the development of optical communication and quantum communication. The traditional Bessel beam generation methods are circular slit method, holographic method or axicon method, but the disadvantages of these methods are not too high requirements on the processing accuracy of the device, or the energy utilization rate is too low, or they are not compatible with other devices. The inte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q15/12
CPCH01Q15/12
Inventor 袁乐眙丁旭旻张狂吴群
Owner HARBIN INST OF TECH
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