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Holographic image multiplexing method and system based on nonlinear frequency doubling and polarization characteristics

A holographic image and fundamental frequency technology, applied in the field of holography, can solve problems such as background noise, the small number of recurring images, and the inability to realize complex amplitude modulation.

Active Publication Date: 2019-03-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, in order to realize the holographic display of multiple images through linear micro-nano structures, non-target images will form background noise when the target image is reproduced, which will affect the signal-to-noise ratio of image reproduction.
[0004] The current study proposes a method of using nonlinear materials to realize multi-image holographic display. Three holograms can be reproduced by using a single micro-nano holographic dry plate, but the number of reproduced images is small, and only Phase modulation, unable to achieve complex amplitude modulation

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  • Holographic image multiplexing method and system based on nonlinear frequency doubling and polarization characteristics
  • Holographic image multiplexing method and system based on nonlinear frequency doubling and polarization characteristics
  • Holographic image multiplexing method and system based on nonlinear frequency doubling and polarization characteristics

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[0094] In the first embodiment of the present invention, circularly polarized light is used as incident light to realize phase holographic multiplexing of holographic images.

[0095] When circularly polarized light is used as the incident light, there are two cases of right-handed light incident and left-handed light incident; while the outgoing light also has left-handed and right-handed components.

[0096] For formula (4) and formula (5), it is defined that σ=1 for right-handed light and σ=-1 for left-handed light.

[0097] When the incident light is right-handed and the frequency is ω, for the outgoing light of the fundamental frequency with the frequency ω, n=1. When the right-handed component of the outgoing light is considered, the polarizability of the incident light is the same, and the geometric phase introduced is 0; when the left-handed component is examined, it is opposite to the polarization of the incident light, and the geometric phase of 2θ is introduced. Fo...

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Abstract

The invention provides a hologram multiplexing method and system. The method comprises the following steps of (S1) obtaining phase information of each pixel of each hologram when different holograms are reproduced at different frequencies on the basis of a micro-nano structure; (S2) carrying out corresponding phase encoding modulation on phase modulation units of the micro-nano structure on the basis of the phase information; and (S3) making incident light in different polarization states enter the encoded micro-nano structure and obtaining reproduced images of different holograms. Phase encoding modulation is carried out on the phase modulation unit of the micro-nano structure by using a frequency doubling characteristic of a super-surface material of the micro-nano structure and different phase modulation formed by polarity corresponding relationships at different frequency doubling to obtain reproduction of multiple holograms; and the influence of background noise of the reproduction result is eliminated through image filtering. In addition, one complex amplitude modulation unit is formed through combining two phase modulation units to modulate pixel elements, thereby obtaining multi-image complex amplitude-modulated holograms.

Description

technical field [0001] The present invention relates to the technical field of holography, and more specifically, to a method and system for multiplexing holographic images based on nonlinear frequency doubling and polarization characteristics. Background technique [0002] At present, an important research direction in computational holography technology is to use metasurfaces composed of micro-nano structures to realize holographic image display. The implementation of this kind of computational holography is based on the linear characteristics of the micro-nano structure, and the metasurface composed of nano-antennas, sub-wavelength split rings and other micro-nano structures that encode and sort the phases of the holograms. The dipole array formed under the action of the incident light realizes the phase modulation of the incident light. [0003] The holographic display is performed by using the linear characteristics of the micro-nano structure, and the holographic disp...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03H1/26
CPCG03H1/2645G03H2001/267
Inventor 刘娟彭玮婷李昕
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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