Active Phase Modulation and Holographic Encryption Method Based on Hybrid Metasurface
A technology of active phase and encryption method, applied in the field of micro-nano optics, can solve the problem of time-consuming and other problems, and achieve the effect of good encryption performance, convenient and time-saving overall modulation
Active Publication Date: 2020-10-02
BEIJING INSTITUTE OF TECHNOLOGYGY
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However, most of these actively adjustable solutions are modulated point by point, which takes a long time
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Embodiment 1
[0028] The active phase modulation and holographic encryption method based on the hybrid metasurface disclosed in the embodiment, the flow chart is as attachedfigure 1 As shown, the phase of the outgoing beam is regulated under the irradiation of light with a wavelength of 1900nm, and the specific implementation method is as follows:
[0029] Step 1: use germanium tellurium antimonide Ge2Sb2Te5 (GST) to construct a phase change material film, the open metal ring is a C-type gold nanoring, and a hybrid metasurface is formed by C-type gold nanoring arrays with different geometric sizes on the GST film; The hybrid metasurface is tuned by the huge refractive index change between the state switching of the GST film and the resonance response of the C-type gold nanorings, as well as the amplitude and phase changes generated by the rotation of the C-type gold nanorings. The transmission phase of the hybrid metasurface can be tuned by switching the GST film state and changing the geome...
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Abstract
The invention relates to an active phase modulation and holographic encryption method based on a hybrid meta-surface, and belongs to the field of micro-nano optics and holographic encryption. The hybrid meta-surface is composed of micro open-mouthed metal ring arrays with different geometric dimensions on a phase change material film. According to a first construction method, two different holographic images are reconstructed in a crystalline state and a non-crystalline state respectively. A second construction method is realized through phase interference imaging of the hybrid meta-surface ina crystalline state and holographic imaging of the hybrid meta-surface in a non-crystalline state. Excitation is actively applied, the phase change material is switched between the crystalline stateand the non-crystalline state, the refractive index of the hybrid meta-surface is changed, and a resonance effect and the geometric phase principle of open-mouthed metal rings are combined to realizeactive phase modulation, switching and hidden image encryption. Compared with a point-by-point pixel modulation method, the method of the invention has the advantages of being capable of overall modulation, convenient and time-saving, and can be applied to holographic encryption, hybrid interference imaging, dynamic holographic display and active optical equipment control.
Description
technical field [0001] The invention relates to an active phase modulation and holographic encryption method based on a hybrid metasurface, in particular to a phase modulation method based on phase change materials switching between crystalline and amorphous states. It belongs to the field of micro-nano optics and holographic encryption application technology. Background technique [0002] A metasurface is a two-dimensional artificial planar device with novel properties that can be achieved beyond natural materials, capable of modulating electromagnetic waves in the sub-wavelength range. Since its invention, metasurfaces have attracted a lot of attention for their flat, high-resolution, and miniaturized properties. With the exploration of its working principle and the development of micro-nano design and fabrication methods, metasurfaces show flexibility in phase modulation, amplitude modulation, polarization control, orbital angular momentum conversion, etc., and their fun...
Claims
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IPC IPC(8): G02F1/01G03H1/08G03H1/00
CPCG02F1/0102G02F1/0121G03H1/0011G03H1/08
Inventor 黄玲玲王涌天周宏强魏群烁李晓炜
Owner BEIJING INSTITUTE OF TECHNOLOGYGY