Photoelectric dynamic modulation system and method based on nanometer paper-cut meta-structure surface

Abstract

The invention provides a photoelectric dynamic modulation system based on a nanometer paper-cut meta-structure surface, and the system comprises the nanometer paper-cut meta-structure surface which comprises a nanometer conductive film and a nanometer paper-cut structure unit disposed on the nanometer conductive film; a voltage driving unit which is used for applying voltage between the nano paper-cut structure unit and a transparent electrode which is oppositely arranged so as to enable the nano paper-cut structure unit to generate the three-dimensional elastic deformation; and a voltage adjusting unit which is used for adjusting the voltage of the voltage driving unit to realize the optical wavefront dynamic modulation. The invention further provides a photoelectric dynamic modulation method based on the nanometer paper-cut meta-structure surface. According to the system and the method, the pixel-level addressable dynamic modulation of incident light can be realized, and the system and the method are high in response speed and wide in working band and are easy to integrate.

Description

technical field [0001] The invention relates to a photoelectric dynamic modulation system and method based on a nano-kirigami metasurface, which can be used in the fields of wavefront shaping, information encryption, dynamic holographic display and the like. Background technique [0002] Metasurfaces are usually composed of sub-wavelength metal antennas or resonant cavity arrays. By changing the shape, size and material of the nano-antennas, the pixel-level independent modulation of the amplitude, phase, and polarization state of the incident light can be realized, and the control of the light field can be realized. And produce special optical effects. Limited by the development of processing technology and materials used, the main research is carried out at the level of static modulation, that is, the light field modulation effect of the metasurface cannot be modified after processing, although specific optical shaping can be achieved, for example, with the help of metasurf...

AI Technical Summary

Problems solved by technology

For example, the metasurface technology uses hydrogel as the substrate and metal antenna as the modulation unit. This technology changes the collapse and expansion state of the hydrogel by changing the external temperature, and then changes the pixel pitch of the modulation unit on the metasurface to realize Dynamic modulation of the light wavefront; similar to using a mechanically stretchable material as a substrate, the distribution of the modulation structure on the metasurface can be changed by mechanical stretching, but the above method has high requirements on the physical properties of the substrate material. Accuracy is difficult to guarantee

Phase-change materials such as graphene and vanadium dioxide can also construct optical metasurfaces. With the help of external signals such as light and heat, the material can be switched between crystalline or amorphous states, thereby changing the optical properties of the structure and realizing the dynamics of the light wavefront. Modulation, but its modulation ability is restricted by its own materials, and the processing is difficult, the response speed is slow, and it is not suitable for integration

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