Nonlinear metasurface based four-wave mixing holographic multiplexing method

A four-wave mixing, nonlinear technology, applied in the field of micro-nano holography

Active Publication Date: 2019-08-20
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of the multiplexing degree of freedom of the existing holographic multiplexing, the technical problem to be solved by the four-wave mixing holographic multiplexing method based on the nonlinear metasurface disclo

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Embodiment 1

[0050] Such as figure 1As shown, in the four-wave mixing holographic multiplexing method based on the nonlinear metasurface disclosed in this embodiment, the metasurface for realizing nonlinear space and frequency multiplexing is composed of an array of gold nano-rectangular hole structures with different geometric sizes. By changing the geometric size of the gold nano-rectangular hole structure, the nonlinear metasurface can arbitrarily regulate the amplitude and phase of the outgoing nonlinear frequency signal. The complex amplitude distribution of the outgoing nonlinear optical field under different sizes is obtained by full-wave vector calculation. The amplitude type hologram is calculated based on the optimized GS algorithm, and the gold rectangular hole structure is encoded to the hologram according to the bit coding method. The GS algorithm is an optimization algorithm s that iterates on the holographic surface and the reconstruction surface during the hologram calcula...

Embodiment 1

[0068] The four-wave mixing holographic multiplexing method based on the nonlinear metasurface disclosed in the first embodiment utilizes the four-wave mixing effect of the gold nanometer rectangular hole to realize the spatial and frequency multiplexing of the amplitude hologram. Adjusting λ by changing the length and width of the gold nano-rectangular hole FWM1 and at λ FWM2 The complex amplitude of the corresponding outgoing nonlinear light field component at ; find the satisfying in λ FWM1 and at λ FWM2The amplitude at the place satisfies two-bit encoding, and the four gold nanometer rectangular hole structures with uniform phases are used for holographic multiplexing encoding. Two holograms carrying independent information are obtained by calculation and the selected gold nano-rectangular pore structure is encoded on the same metasurface. By selecting the outgoing component parallel to the incident light field, it is achieved at λ FWM1 produces a reconstructed image '...

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Abstract

The invention discloses a nonlinear metasurface based four-wave mixing holographic multiplexing method, and belongs to the micro nano holographic field. The method comprises that a metasurface is composed of an array with nanometer rectangular hole structures in different geometric sizes; the geometric sizes of the nanometer rectangular hole structures are changed, so that the nonlinear metasurface can randomly regulates the amplitude and phase of an output nonlinear frequency signal; complex amplitude distribution of the nonlinear light field output in different sizes can be obtained by fullwave vector calculation; an amplitude type hologram is calculated based on an optimized GS algorithm, and a bit coding method is used to code the hologram of the rectangular hole structure; rectangular hole structure distribution is determined by coding, and the corresponding nonlinear metasurface structure array is generated; and two beams of femtosecond pulses in different frequency are input torealize nonlinear holographic space and frequency multiplexing of the same nonlinear metasurface structure array. The method can be applied to the fields including signal processing, optical storage,high-dimensional holographic anti-counterfeiting and optical encryption.

Description

technical field [0001] The invention relates to a four-wave mixing holographic multiplexing method based on a nonlinear metasurface, belonging to the field of micro-nano holography. Background technique [0002] Holography can be used to record and reconstruct all information about an object. With the advent of computational holography, hologram generation can be done more simply by programming. Conventional techniques for realizing holography by using spatial light modulators and diffractive optical elements are limited by large pixel size, small field of view, and limited spatial bandwidth product. Metasurfaces are subwavelength structured devices capable of flexibly shaping wavefronts, and thus serve as a design platform for high-performance holography. Recently, metasurface-based holographic multiplexing has attracted extensive research because it is capable of recording multiple images in the same spatial region; it has the advantages of ultra-small size, subwavelengt...

Claims

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Application Information

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IPC IPC(8): G02F1/35G03H1/26
CPCG02F1/3536G03H1/2645
Inventor 黄玲玲林泽萌徐振涛李晓炜王涌天
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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