Liquid crystal polymer polarization grating and preparation method and application thereof

A liquid crystal polymer and polarization grating technology, applied in the field of radar, can solve the problems of large volume of optical phased array radar and high cost of optical phased array radar

Inactive Publication Date: 2020-06-12
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the cost of optical phased array radar is generally relatively high, and in order to achieve large-angle precision scanning, it requires a large number of ant

Method used

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  • Liquid crystal polymer polarization grating and preparation method and application thereof
  • Liquid crystal polymer polarization grating and preparation method and application thereof
  • Liquid crystal polymer polarization grating and preparation method and application thereof

Examples

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Embodiment 1

[0080] This embodiment provides a liquid crystal polymer polarization grating, such as figure 1 As shown, the liquid crystal polymer polarization grating includes a transparent substrate 100 , an optical alignment film 200 disposed on one surface of the transparent substrate 100 , and a liquid crystal polymer film 300 disposed on the surface of the optical alignment film 200 away from the transparent substrate 100 .

[0081] In the present invention, the director distribution of a layer of liquid crystal polymer molecules close to the photo-alignment film in the liquid crystal polymer film is perpendicular to the molecular director distribution of the photo-control alignment film, that is, the molecular director of the liquid crystal polymer film The distribution is shifted by half a period relative to the molecular director distribution of the photoalignment film.

[0082] figure 2 It is a schematic diagram of the director distribution of a layer of liquid crystal polymer m...

Embodiment 2

[0096] This embodiment provides a two-dimensional optical scanning based on liquid crystal polymer optical phased array radar. On the basis of the experiment in Embodiment 1, by changing the applied voltage of the adjustable liquid crystal wave plate and changing the polarization state of the incident light, a single target scan.

[0097] Figure 7 The four diffraction orders obtained based on liquid crystal polymer optical phased array radar provided in this embodiment. In the two x and y directions (the direction from left to right is recorded as the x direction, and the direction from bottom to top is recorded as the y direction. If the x direction and y direction appear later, the meaning of the reference is the same as here After the same) polarization gratings are cascaded, the polarization state of the incident light is changed so that all the linearly polarized light is obtained through the adjustable liquid crystal wave plate. When linearly polarized light passes th...

Embodiment 3

[0100] This embodiment provides a two-dimensional optical scanning based on liquid crystal polymer optical phased array radar. On the basis of the experiment in Embodiment 1, by changing the applied voltage of the adjustable liquid crystal wave plate and changing the polarization state of incident light, two target scan.

[0101] Figure 12 , Figure 13 The scanning results of two targets obtained by the liquid crystal polymer optical phased array radar provided in this embodiment. by Figure 12 As an example, adjust the first adjustable liquid crystal wave plate so that the polarization state of the incident light is left-handed circularly polarized light, so that a diffracted light deflected to the left is obtained through the first polarization grating in the x direction, and the polarization state of the diffracted light For right-handed circularly polarized light. At the same time, the second adjustable liquid crystal wave plate is adjusted so that it is equivalent to...

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Abstract

The invention provides a liquid crystal polymer polarization grating and a preparation method and application thereof, and particularly relates to a liquid crystal polymer polarization grating and a preparation method thereof, combination cascade of the liquid crystal polymer polarization grating and application thereof in two-dimensional optical scanning, and optical phased array radar comprisingcombination cascade and application thereof. The liquid crystal polymer polarization grating comprises a light-operated orientation film and a liquid crystal polymer film arranged on one side of thelight-operated orientation film. The molecular director direction of the light-operated orientation film is in periodic gradual change distribution; the director distribution of a layer of liquid crystal molecules, close to the photo-alignment film, in the liquid crystal polymer film is the same as that of molecules of the photo-alignment film; the liquid crystal polymer polarization grating has asmall area and a high integration degree, and the prepared optical phased array radar has the advantages of being small in size, low in cost, high in response speed, simple in control process and thelike.

Description

technical field [0001] The invention belongs to the field of radar, and relates to a liquid crystal polymer polarization grating and its preparation method and application, in particular to a liquid crystal polymer polarization grating and its preparation method, including combined cascading of liquid crystal polymer polarization gratings and two-dimensional optical scanning Applications in , including combined and cascaded optical phased array radars and their applications. Background technique [0002] Optical radar is a method of measuring the distance parameter of a target by irradiating laser light on the target object and measuring the received laser signal. At the same time, optical radar has broad application prospects in the field of unmanned driving. Optical radar can be used as a sensor for unmanned driving to realize the judgment of real-time road conditions. And optical radar also has a very wide range of applications in the fields of unmanned aerial vehicles a...

Claims

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Application Information

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IPC IPC(8): G02F1/29G02F1/1337G02B5/18G02B5/30
CPCG02B5/1857G02B5/3016G02F1/133788G02F1/292
Inventor 胡伟魏挺沈志雄陆延青徐飞
Owner NANJING UNIV
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