Single-layer planar chirality metal structure circular polarizer

A circular polarizer and metal structure technology, applied in polarizing elements, instruments, optics, etc., can solve the problems of low absorption loss, difficult to achieve, and high transmittance, and achieve the effects of small thickness, easy integration, and reduced difficulty

Inactive Publication Date: 2015-01-28
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0004] Aiming at the problem that the existing circular polarizer usually adopts a multi-layer rotating or three-dimensional helical structure, which is complicated to process and difficult to realize, the present invention proposes a single-layer planar chiral metal structure circular polarizer, which is composed of a single-layer planar structure , easy to process and integrate, at the same time, the circular polarizer has the advantages of thin thickness, small size, compact structure, good discrimination efficiency, low device absorption loss and high transmittance for left-handed and right-handed circularly polarized electromagnetic waves

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[0029] The specific implementation manners of the present invention will be further introduced below in conjunction with the accompanying drawings.

[0030] Previous studies have shown that asymmetric transmission of left-handed and right-handed polarized light can be achieved using planar chiral structures (V.A. Fedotov et al, "Asymmetric Transmission of Light and Enantiomerically Sensitive Plasmon Resonance in Planar Chiral Nanostructures", Nano Letters 7, 1996 (2007)). However, in the planar chiral structures studied in the past, the difference in transmittance between left-handed and right-handed polarized light is within 0.2, and it is impossible to realize circular polarizers. The reason is that the thickness of the planar chiral structures studied in the past is often very thin, no more than one-tenth of the thickness of the working electromagnetic wave. Planar resonance mode, its effect is not enough to effectively discriminate left-handed and right-handed polarized l...

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Abstract

The invention relates to a single-layer planar chirality metal structure circular polarizer which belongs to electromagnetic wave devices, and belongs to the technical field of electromagnetic waves of optics, terahertz, microwaves and other frequency bands. The circular polarizer is formed by a single-layer metal structure with planar chirality, and the functions of the circular polarizer are achieved on the basis of a one-way mode switching principle. The circular polarizer is easy to machine and integrate, thin, small in size and compact in structure, has high efficiency of screening on left-hand and right-hand circular polarization electromagnetic waves, and is low in device absorption loss and high in transmittance. By changing the design of the size and the structural design of the circular polarizer, the circular polarization function can be achieved at different electromagnetic frequency bands such as optics, terahertz and microwaves. The circular polarizer can achieve low-cost and large-area manufacturing, and has important application in the fields of optical microscopy, three-dimensional display, laser technologies, communication, radar and the like.

Description

technical field [0001] The invention belongs to electromagnetic wave devices and relates to the technical fields of optics, terahertz, microwave and other frequency band electromagnetic waves, in particular to a single-layer planar chiral metal structure circular polarizer. Background technique [0002] Circular polarizer is an important polarization component in the fields of optics, terahertz, microwave and other electromagnetic waves. It has important applications in optical microscopy, three-dimensional display, laser technology, communication, radar and other fields. At present, in the optical field, two discrete components, a linear polarizer and a quarter-wave plate, are usually used to form a circular polarizer. The biggest disadvantage of this structure is that two separate optical components are used, so the device size is large, which is not conducive to integration. At the same time, limited by the operating wavelength range of the quarter-wave plate, this devic...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30H01Q15/00
CPCG02B5/3025H01Q15/0006
Inventor 叶卫民袁晓东郭楚才张检发杨彪刘肯朱志宏曾淳
Owner NAT UNIV OF DEFENSE TECH
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