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Preparation method of liquid crystal elastomer film, tunable filter and preparation method of tunable filter

A technology of liquid crystal elastomer and liquid crystal monomer, which is applied in the optical field and can solve the problems of single working wavelength and limited application range.

Active Publication Date: 2020-09-18
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing metasurface optical filters only have a single working wavelength after fabrication, and their application range is greatly limited.

Method used

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  • Preparation method of liquid crystal elastomer film, tunable filter and preparation method of tunable filter
  • Preparation method of liquid crystal elastomer film, tunable filter and preparation method of tunable filter
  • Preparation method of liquid crystal elastomer film, tunable filter and preparation method of tunable filter

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Experimental program
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Embodiment 1

[0043] Such as figure 1 As shown, Embodiment 1 of the present invention provides a method for preparing a liquid crystal elastomer film, the method comprising:

[0044] S110, mixing and stirring the liquid crystal monomer, the crosslinking agent and the photoinitiator to obtain a liquid crystal elastomer mixture.

[0045] In this embodiment, when preparing the liquid crystal elastomer film, firstly, the liquid crystal monomer, the crosslinking agent and the photoinitiator are mixed and fully stirred to obtain the liquid crystal elastomer mixed liquid. Among them, the molecules of the liquid crystal monomer are rod-like structures with an aspect ratio of 4:1, and the ends of the molecules contain polar or polarizable groups to keep the molecules in an orderly orientation, and the long axis of the molecules is easy to bend and has a certain rigidity. . Crosslinking agent is also called curing agent, hardener or curing agent, it can transform linear or slightly branched macromo...

Embodiment 2

[0053] Such as figure 2 As shown, Embodiment 2 of the present invention provides a method for preparing a liquid crystal elastomer film. Embodiment 2 of the present invention is a further explanation and optimization based on Embodiment 1 of the present invention. The method includes:

[0054] S210, mixing and stirring the liquid crystal monomer, the crosslinking agent, the photoinitiator and the photoresponsive dye to obtain a liquid crystal elastomer mixture.

[0055] In this embodiment, a photoresponsive dye is also added to the liquid crystal elastomer mixture, that is, a small amount of dye molecules with saturated absorption is doped. The concentrations are 78.55mol%, 20mol%, 0.92mol%, 0.53mol%, respectively. The dye molecules help to efficiently absorb pumping light, which is the process of using light to raise (or "pump") electrons from a lower energy level in an atom or molecule to a higher energy level. Embodiments of the present invention A photothermal effect is...

Embodiment 3

[0066] Such as image 3 As shown, Embodiment 3 of the present invention provides a method for preparing a tunable filter, using the liquid crystal elastomer film prepared by the method for preparing a liquid crystal elastomer film provided in Embodiment 1 or Embodiment 2 of the present invention. The method include:

[0067] S310, drop the mixed solution of deionized water, ethanol and polystyrene nanospheres onto the surface of the deionized water to obtain a monolayer polystyrene nanosphere structure.

[0068] In this embodiment, the prepared tunable filter includes a liquid crystal elastomer film as a substrate and a plurality of nanostructures arranged periodically on the substrate, that is, a metasurface is prepared on the liquid crystal elastomer film. Specifically, the mixed liquid of deionized water, ethanol and polystyrene nanospheres is dropped onto the surface of deionized water to obtain a single-layer polystyrene nanosphere structure, that is, the self-assembly t...

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Abstract

The invention discloses a preparation method of a liquid crystal elastomer film, a tunable filter and a preparation method of the tunable filter. The preparation method of the liquid crystal elastomerfilm comprises the following steps: mixing and stirring a liquid crystal monomer, a cross-linking agent and a photoinitiator to obtain a liquid crystal elastomer mixed solution, performing friction orientation on the two glass plates spin-coated with orientation layers in the same direction, bonding the two glass plates according to the friction orientation direction at a preset distance intervalto obtain a liquid crystal box, pouring the liquid crystal elastomer mixed solution into the liquid crystal box, and carrying out ultraviolet exposure to make the liquid crystal elastomer mixed solution fully polymerize, thereby obtaining the liquid crystal elastomer film with uniform molecular orientation. According to the embodiment of the invention, the tunability of the optical filter is realized.

Description

technical field [0001] The embodiments of the present invention relate to optical technology, and in particular to a preparation method of a liquid crystal elastomer film, a tunable filter and a preparation method thereof. Background technique [0002] Optical filters play a very important role in technical fields such as spectral imaging, wavelength selection, optical noise filtering, and optical multiplexing / demultiplexing. And several new types of filters. [0003] The filter based on the principle of dispersion spectroscopy mainly splits the signal light through a grating or prism, and then filters the optical signal of a single spectral line element. The optical path of the dispersion type filter is relatively complicated, and its volume and weight are relatively large, which is not conducive to Used in portable operation scenarios. Filters based on the principle of interference film filtering selectively filter signal light by designing dielectric films with differen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L101/12C23C14/20C23C14/24C23C14/04G02F1/1337G02F1/01
CPCC08J5/18C23C14/20C23C14/24C23C14/042G02F1/133784G02F1/0147C08J2300/12C08J2300/26
Inventor 刘言军刘建勋
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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