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Method for generating vector light beam based on transmission-type medium metasurface

A transmission-type, light-beam technology, applied in the field of micro-nano optics, can solve the problems of complex experimental optical path and large geometric size of optical components, and achieve the effects of high transmission efficiency, light weight and small volume

Active Publication Date: 2018-09-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the methods (1)-(3) mentioned above, there are disadvantages such as the complexity of the experimental optical path or the large geometric size of the optical elements used, which limits the inapplicability of such methods to miniaturized and compact optical systems

Method used

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  • Method for generating vector light beam based on transmission-type medium metasurface
  • Method for generating vector light beam based on transmission-type medium metasurface
  • Method for generating vector light beam based on transmission-type medium metasurface

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Embodiment 1

[0040] Embodiment 1: Generation method of cylindrical vector beam

[0041] Such as figure 1 As shown, this embodiment is based on the method of generating cylindrical vector beams on the transmissive medium metasurface, and the specific implementation method is as follows:

[0042] Step 1: The metasurface used to generate columnar vector beams is composed of nanopillar arrays with the same geometric size and different azimuth angles. The geometric dimensions of the nanocolumn unit are designed so that the nanocolumn has the function of a half-wave plate under the light irradiation of a specific working wavelength, and the polarization direction of the outgoing light field can be adjusted by rotating the nanocolumn. The geometric dimensions include the length L of the major axis, the length W of the minor axis, the height H of the nanopillar and the period S of the metasurface unit.

[0043] In order to realize the column vector beam generation based on the transmissive mediu...

Embodiment 2

[0057] Embodiment 2: The generation method of the vector beam that can be used for polarization encryption

[0058] Such as figure 1 As shown, this embodiment is based on the method of generating vector beams with arbitrary polarization direction distribution based on the transmissive medium metasurface. With this method, the polarization pattern can be hidden in the vector beam, and the specific implementation method is as follows:

[0059] Step 1: The metasurface used to generate the vector beam of the polarization-encrypted pattern is composed of nanopillar arrays with the same geometric size and different azimuth angles. The geometric dimensions of the nanocolumn unit are designed so that the nanocolumn has the function of a half-wave plate under the light irradiation of a specific working wavelength, and the polarization direction of the outgoing light field can be adjusted by rotating the nanocolumn. The geometric dimensions include the length L of the major axis, the ...

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Abstract

The invention discloses a method for generating a vector light beam based on a transmission-type medium metasurface, and belongs to the field of micro-nano optics. The method comprises the steps: selecting a noncrystalline silicon nanorod as a medium metasurface structure unit, carrying out the designing according to the geometric size of the nanorod, and enabling the nanorod to have a half wave plate function under the irradiation of light with the specific working wavelength; changing an azimuth angle of the nanorod unit and achieving the regulation and control of the polarization directionof an emergent optical field; obtaining the azimuth angle distribution of a nanorod array according to the polarization direction distribution of a target rod vector light beam, generating a processing file through coding, and carrying out the processing; and obtaining the target rod vector light beam after the incident polarization light passes through the medium metasurface. The invention also discloses a method for generating a vector light beam distributed in any polarization direction based on the transmission-type medium metasurface, and the method can be used for enabling a polarizationpattern to be hidden in the vector light beam, and is used for optical anti-fake occasions and polarization encryption occasions. The method can generate any vector light beam in a miniature and compact optical system.

Description

technical field [0001] The invention relates to a method for generating an arbitrary vector beam, in particular to a method for generating a vector beam based on a transmissive medium metasurface, and belongs to the field of micro-nano optics. Background technique [0002] Metasurfaces are usually composed of a layer of subwavelength-sized metallic or dielectric nanoantenna arrays. Because of its ability to arbitrarily modulate the phase, amplitude and polarization of incident electromagnetic waves, it has attracted extensive attention from researchers. Compared with traditional optical elements that use the phase accumulation of light during propagation to regulate the light field, metasurfaces provide a new method to regulate the characteristics of the light field through the interaction of light and nanoantennas. By adjusting the shape, size and azimuth angle of the nano-antenna array, the wavefront of the incident light can be flexibly adjusted. [0003] The polarizati...

Claims

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Application Information

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IPC IPC(8): G02B26/00G02B27/28B81C1/00G02F1/01
CPCB81C1/00031G02B26/00G02B27/286G02F1/0136
Inventor 黄玲玲赵睿哲王涌天
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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