Double-period composite liquid crystal polarization grating

A liquid crystal polarization grating and double-period technology, applied in polarizing elements, optics, optical elements, etc., can solve problems such as energy loss and complex structure, and achieve the effects of large deflection angle, broad application prospects, and high efficiency

Active Publication Date: 2020-01-03
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to design and manufacture a double-period compound liquid crystal polarization grating, which solves the problems of serious energy loss and complex structure caused by the need to convert incident light into circularly polarized light in current liquid crystal polarization gratings.

Method used

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  • Double-period composite liquid crystal polarization grating
  • Double-period composite liquid crystal polarization grating
  • Double-period composite liquid crystal polarization grating

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Embodiment Construction

[0036] 1. Analysis of the polarization state of the liquid crystal polarization grating in the near field

[0037] figure 2 The distribution of the polarization state of the near-field outgoing light is given for a liquid crystal polarization grating that satisfies the half-wave retardation Δnd=λ / 2 in the case of right-handed circular polarization input and linear polarization input, respectively. When the right-handed circular polarization is input, the near-field outgoing light is equal-strength left-handed circularly polarized light with different phases. It is further found that the period of the outgoing polarization distribution is exactly half of the grating period. The isophase surface drawn on the figure can explain the liquid crystal The formula tanθ satisfied by the deflection angle of the polarization grating when it is incident m =mλ / Λ, m=±1. For linearly polarized input, the near-field outgoing light is linearly polarized light with different polarization direction...

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Abstract

The invention discloses a double-period composite liquid crystal polarization grating structure and a preparation method thereof, belongs to the technical field of non-mechanical optical beam deflection in an active electro-optical system, and mainly aims at problems of serious energy loss, complex structure and the like of a conventional liquid crystal polarization grating, which are caused by acase that incident light needs to be converted into circular polarized light. The double-period composite liquid crystal polarization grating is disclosed on the basis of in-depth understanding on a polarization state modulation type optical component and has excellent response to linearly polarized incident light, and an optical beam is deflected to the plus 1 level and the minus 1 level under the diffraction efficiency of nearly 100% only by controlling a polarization direction of the linearly polarized incident light. Compared to the conventional liquid crystal polarization grating implemented before, the double-period composite liquid crystal polarization grating structure is simpler in the aspects of system control and assembly and judgment and is obviously promoted in the aspects ofthe energy utilization rate and the like.

Description

Technical field [0001] The invention belongs to the technical field of non-mechanical beam deflection in active optoelectronic systems, and specifically refers to a dual-period composite liquid crystal polarization grating. [0002] The present invention relates to polarization gratings, and more particularly to the design of liquid crystal polarization gratings and the production of related devices. Background technique [0003] The liquid crystal polarization grating is a new type of element that can realize large-angle beam deflection. Based on the principle of light polarization state modulation and geometric phase modulation, it can deflect circularly polarized light to the +1 or -1 order with nearly 100% diffraction efficiency. The direction of deflection depends on the polarization state of the incident light. According to the classification of working methods, the liquid crystal polarization grating can be divided into active liquid crystal polarization grating and passive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1347G02F1/1337G02F1/29G02B5/30
CPCG02B5/3016G02F1/133788G02F1/1347G02F1/29
Inventor 王启东陈万穆全全彭增辉刘永刚宣丽鲁兴海
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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