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A dual-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 the problems of complex structure, energy loss, etc., and achieve the effects of large deflection angle, high efficiency, and broad application prospects

Active Publication Date: 2020-12-29
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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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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  • A dual-period composite liquid crystal polarization grating
  • A dual-period composite liquid crystal polarization grating
  • A dual-period composite liquid crystal polarization grating

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Embodiment Construction

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

[0037] figure 2 The polarization distributions of the near-field outgoing light from the liquid crystal polarization grating satisfying the half-wave delay Δnd=λ / 2 under the conditions of right-handed circular polarization input and linear polarization input are given. When right-handed circular polarization is input, the exiting light in the near field is equal intensity left-handed circularly polarized light with different phases. It is further found that the period of the outgoing polarization state distribution is exactly half of the period of the grating. The equiphase plane drawn on the figure can explain the liquid crystal The deflection angle satisfies the formula tanθ when the polarization grating is normal incidence m =mλ / Λ, m=±1. For linearly polarized input, the outgoing light in the near field is linearly polarized light with different polarization direct...

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Abstract

The invention discloses a dual-period compound liquid crystal polarization grating structure and its preparation method, which belongs to the technical field of non-mechanical beam deflection in active photoelectric systems, and mainly aims at the traditional liquid crystal polarization grating that needs to convert incident light into circularly polarized light. The resulting energy loss is serious and the structure is complex. The dual-period compound liquid crystal polarization grating is proposed based on a deep understanding of polarization state modulation optical elements. It has a good response to linearly polarized incident light. It only needs to control the polarization direction of the incident linearly polarized light to make the beam Favors +1 and ‑1 orders with nearly 100% diffraction efficiency. Compared with the traditional liquid crystal polarization grating that has been realized before, it is more concise in system control and adjustment, and has a significant improvement in energy utilization.

Description

technical field [0001] The invention belongs to the technical field of non-mechanical light beam deflection in active photoelectric systems, and specifically refers to a double-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 fabrication of related devices. Background technique [0003] Liquid crystal polarization grating is a new type of component that can realize large-angle beam deflection. Based on the principle of polarization state modulation and geometric phase modulation of light, it can deflect circularly polarized light to +1 order or -1 order with nearly 100% diffraction efficiency. The direction of deflection depends on the polarization state of the incident light. According to the working mode, liquid crystal polarization gratings can be divided into active liquid crystal polarization gratings and passive liqu...

Claims

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Application Information

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Patent Type & Authority Patents(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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