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Metasurface holographic method based on polarization and orbital angular momentum encryption

A technology of orbital angular momentum and metasurface, applied in the field of holographic multiplexing and micro-nano optics, can solve the problems of small information capacity, crosstalk, and large amount of computation

Active Publication Date: 2020-06-05
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems that the existing metasurface holographic multiplexing technology has different channel crosstalk, small information capacity, and large calculation amount, so it cannot meet the needs of practical applications

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  • Metasurface holographic method based on polarization and orbital angular momentum encryption

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Embodiment 1

[0032] The metasurface holography method based on polarization and orbital angular momentum encryption disclosed in the embodiment, the process is as follows figure 1 As shown, the phase of the outgoing beam is regulated under the irradiation of light with a wavelength of 800nm, and the specific implementation method is as follows:

[0033] Step 1: The holographic metasurface used to realize polarization and orbital angular momentum encryption is composed of multiple dielectric pillar arrays with different geometric sizes and rectangular cross-sections. Three holograms (φ 1 , φ 2 and φ 3 ), where the first two holograms are associated with the third hologram. Firstly, the length and width of the dielectric cylinder are scanned to determine the complex amplitude modulation characteristics of the dielectric cylinder to the plane beam, and obtain the phase diagram. According to the birefringence characteristics of the metasurface structure and the Berry phase principle and the ...

Embodiment 2

[0042] Step 1: The holographic metasurface used to realize polarization and orbital angular momentum encryption is composed of multiple dielectric pillar arrays with different geometric sizes and rectangular cross-sections. Using the optimized hologram algorithm to generate two holograms (φ 1 and φ 2 ), where the first two holograms are independent of each other. Firstly, the length and width of the dielectric cylinder are scanned to determine the complex amplitude modulation characteristics of the dielectric cylinder to the plane beam, and obtain the phase diagram. According to the birefringence characteristics of the metasurface structure and the Berry phase principle and the hologram generated by calculation, the metasurface units are designed and arranged. By controlling the polarization state of the incident beam and the outgoing beam and the orbital angular momentum of the incident beam, the corresponding hologram reconstruction image can be obtained on its Fourier pla...

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Abstract

The invention relates to a metasurface holographic method based on polarization and orbital angular momentum encryption, which belongs to the field of micro-nano optics and holographic multiplexing. According to the invention, different holographic images can be reconstructed on a detection plane for vortex beams carrying specific orbital angular momentum and combinations of input and output polarization states matching the vortex beams; no crosstalk exists between different output polarization channels; a vortex light beam array can be realized in an orthogonal polarization channel and is used as an indicator of angular momentum carried by an input light beam; further, the orbital angular momentum selective holography can provide additional flexibility for erasing and modifying holographyreconstructed images; by depicting specific image details with the orbital angular momentum beam while preserving useful aspects of the image, some hidden (disguised) information can be disclosed, thereby providing a scene that is more complex than plane wave illumination conditions; and the method provided by the invention have the ability to modify image information for the orbital angular momentum beam.

Description

technical field [0001] The invention relates to a metasurface holographic method based on polarization and orbital angular momentum encryption, which belongs to the field of micro-nano optics and holographic multiplexing. Background technique [0002] In recent years, a generalized Snell's law has been developed by generating gradients of abrupt phase transitions in the subwavelength range of patterned interfaces (i.e., metasurfaces), providing new insights into the transfer of wavefront modulation from bulk elements to ultrathin surfaces. Way. Metasurfaces can provide a general platform for tailoring electromagnetic wavefronts by designing two-dimensional nanoscale antenna or resonator arrays. Metasurfaces have successfully enabled a wide range of practical applications in micro-optics in unprecedented ways, including beam shaping, optical cloaking, holographic displays, nonlinear optics, optical encryption, and storage. In particular, metasurface holography can overcome ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03H1/00G03H1/04G03H1/08
CPCG03H1/0005G03H1/0011G03H1/0443G03H1/0808G03H1/0866G03H2001/0825
Inventor 黄玲玲周宏强王涌天赵睿哲魏群烁李晓炜
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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