Optical field dynamic modulation and spatial multiplexing method based on reconfigurable hybrid metasurface

A technology of spatial multiplexing and dynamic modulation, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as the inability to achieve dynamic control, and achieve the effect of enriching the design freedom and dynamically regulating the light field

Active Publication Date: 2019-08-06
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that dynamic control cannot be realized in the existing light field control, and to provide a method for dynamic light field modulation and spatial multiplexing based on reconfigurable hybrid metasurfaces

Method used

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  • Optical field dynamic modulation and spatial multiplexing method based on reconfigurable hybrid metasurface
  • Optical field dynamic modulation and spatial multiplexing method based on reconfigurable hybrid metasurface
  • Optical field dynamic modulation and spatial multiplexing method based on reconfigurable hybrid metasurface

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Embodiment 1

[0033] Anomalous refraction modulation in different states of phase change materials

[0034] Such as figure 1 As shown, the hybrid reconfigurable metasurface-based light field dynamic modulation and spatial multiplexing method disclosed in this embodiment, the specific implementation method is as follows:

[0035] Step 1: The hybrid reconfigurable metasurface used to realize dynamic modulation and spatial multiplexing of light field is composed of compound concentric ring groups with different geometric sizes and different azimuth angles. The composite ring structure is composed of two parts, which are gold and vanadium dioxide in different proportions. By changing the geometric size of the compound ring structure and the azimuth of the symmetry axis, the hybrid reconfigurable metasurface can adjust the amplitude and phase of the outgoing beam arbitrarily. The geometric dimensions include the opening angle θ of the composite ring structure, the orientation angle α, and the ...

Embodiment 2

[0045] Light Field Mode Dynamic Modulation and Spatial Multiplexing Method

[0046] Step 1: Through the phase formula of vortex light Calculate the phase distribution corresponding to the semiconductor state, where i is the imaginary unit, l and are the topological charge number and azimuth angle, respectively. According to the phase distribution corresponding to the semiconductor state, the eight composite ring structures in Example 1 are encoded onto the same hybrid reconfigurable metasurface. By selecting the outgoing component orthogonal to the incident light field, the vortex light is generated in the semiconductor state of vanadium dioxide, and the discrete beams are generated in the same space in the metal state, and spatial multiplexing is realized at the same time.

[0047] Figure 6 It is a simulation diagram for realizing light field modulation and spatial multiplexing. The encoded hybrid reconfigurable metasurface arrays have dual functional properties, gener...

Embodiment 1

[0050]The method of dynamic modulation and spatial multiplexing of light field based on the hybrid reconfigurable metasurface disclosed in Embodiment 1 and Embodiment 2 utilizes the different refractive index characteristics of the phase change material vanadium dioxide in different states. By changing the outer diameter of the composite ring structure and the proportion of vanadium dioxide in different states of vanadium dioxide, four composites that satisfy the phase coverage of 0-π in the semiconductor state of vanadium dioxide and constant phase and uniform amplitude in the metal state are found. Ring structure; by rotating the symmetry axis of these four structures by 90°, these four structures can obtain an additional π phase to obtain another four structures, so that the phase adjustment of the light field under the two phase transitions can cover the complete 0 to 2π range. The two modes of light fields are obtained by calculation, and the selected composite ring struc...

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Abstract

The invention relates to an optical field dynamic modulation and spatial multiplexing method based on a reconfigurable hybrid metasurface, and belongs to the technical field of micro-nano optics and light beam shaping application. The hybrid reconfigurable metasurface for realizing optical field dynamic modulation and spatial multiplexing is composed of a composite circular ring array with different geometric sizes and different symmetry axis arrangements. By changing the geometric size of the composite circular ring and the direction of the symmetry axis, the mixed reconfigurable metasurfacecan adjust and control the amplitude and the phase of emergent light beams at will. And optical field complex amplitude distribution in different modes is obtained through two-dimensional full-wave vector calculation. And according to the obtained optical field complex amplitude distribution in different modes, the geometric dimension and the azimuth angle of the composite circular ring are determined through coding, so that the corresponding hybrid reconfigurable metasurface structure array is generated. Dynamic regulation and control and spatial multiplexing of incident light beams by the same hybrid reconfigurable metasurface are achieved by adjusting the state of the phase-change material.

Description

technical field [0001] The invention relates to a method for dynamic modulation and spatial multiplexing of a light field based on a reconfigurable hybrid metasurface, and belongs to the technical field of micro-nano optics and beam shaping applications. Background technique [0002] Metasurfaces are usually composed of subwavelength-sized metal antennas or dielectric nanoresonator arrays, which can arbitrarily modulate the phase, amplitude and polarization of incident light waves. Compared with traditional optical elements that use the phase accumulation of light during propagation to regulate the light field, metasurfaces provide a way to control the light field through various interactions between light and nanoantennas in a very short distance. A new method for properties. By adjusting the shape, material, and size of the nano-antenna array, the wavefront of the outgoing light can be flexibly adjusted. Reconfigurable metasurfaces increase the design freedom such as lig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/23
Inventor 黄玲玲林泽萌赵睿哲魏群烁王涌天李晓炜
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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