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Method for generating Bessel beam array based on Huygens' meta-surface

A Bessel beam and array technology, applied in the fields of micro-nano optics and binary optics, can solve the problems of restricted beam quality, transmission efficiency, propagation distance, and the large size of Bessel beam components that cannot be integrated, so as to improve compactness. , overcome the effects of beam generation quality and efficiency

Active Publication Date: 2019-10-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, these methods are limited by problems such as beam quality, transmission efficiency, and propagation distance.
Also limited by finite numerical aperture (NA), polarization dependence, etc.
In addition, the components that generate Bessel beams in these methods are generally relatively large and cannot be well integrated in optoelectronic devices.

Method used

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  • Method for generating Bessel beam array based on Huygens' meta-surface
  • Method for generating Bessel beam array based on Huygens' meta-surface
  • Method for generating Bessel beam array based on Huygens' meta-surface

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Embodiment 1

[0025] Due to the maturity of micro-nano processing technology, large-scale processing of micro-nano components and devices has become possible. In addition, the metasurface itself has the advantages of efficient and flexible control of the light field, making the metasurface widely used. Many devices based on metasurfaces have a wide range of applications, such as beam shaping, polarization conversion, holographic display, and so on.

[0026] Method of Bessel Beam Array Generation Based on Huygens Metasurface

[0027] like figure 1 As shown, the Bessel beam array generation method based on the Huygens metasurface disclosed in this embodiment. Its specific implementation method is as follows:

[0028] Step 1: First optimize the phase of the Damman grating and obtain the total phase.

[0029] Use simulated annealing algorithm or genetic algorithm to optimize the phase of 10×10 large period unit of Damman grating, each small period is 400nm. The phase array is obtained by a...

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Abstract

The invention relates to a method for generating a Bessel beam array based on a Huygens' meta-surface, belonging to the technical fields of micro nano optics and binary optics applications. The methodcomprises the following steps: the phase of a Daman grating unit is optimized through a genetic algorithm to realize a uniform-power beam splitting function; the phases of Bessel beams are superimposed to obtain a total phase; a meta-surface is encoded according to the optimized total phase; the phases and amplitudes of outgoing beams are adjusted arbitrarily through the meta-surface by changingthe radius of a disk nanopillar unit; and the phase change of the transmitted light can cover the range from 0 to 2*Pi and the transmittance can be kept over 70% by changing the radius of the nanopillar unit, and a processing file of a corresponding medium meta-surface is generated. A Bessel beam array will be generated in the transmission direction when a sample is irradiated by laser, and the generation result is independent of the incident polarization. The method has the characteristics of long propagation distance and high efficiency.

Description

technical field [0001] The invention relates to a method for generating a polarization-independent large-capacity Bessel beam array, in particular to a method for generating a Bessel beam array based on a Huygens metasurface, belonging to the technical field of micro-nano optics and binary optics applications . Background technique [0002] Metasurfaces are usually composed of a single 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. Traditional optical elements regulate the light field through the phase accumulation of light during propagation, while metasurfaces provide a new method to regulate the characteristics of the light field through the interaction of light and nanoantennas. By adjusting the shape, material, and size of the nano-antenna array, the wavefront of the inci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00
CPCG02B27/0012
Inventor 黄玲玲林泽萌宋旭赵睿哲王涌天李晓炜
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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