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Tunable terahertz magnetically controlled optical switch

An optical switch and terahertz technology, which is applied in the field of terahertz wave controllable functional devices, can solve the problems of high cost and complex manufacturing process of terahertz optical switches, and achieve the effects of low loss, wide operating spectrum range and small insertion loss

Active Publication Date: 2018-08-17
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The manufacturing process of the above-mentioned terahertz optical switch is complicated and the cost is relatively high

Method used

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  • Tunable terahertz magnetically controlled optical switch
  • Tunable terahertz magnetically controlled optical switch
  • Tunable terahertz magnetically controlled optical switch

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Embodiment approach

[0017] 1. Combine figure 1 The tunable terahertz magnetron optical switch provided by the present invention is a cylindrical waveguide with a periodic undulating structure. There are three layers from the inside to the outside. The inner layer is filled with nematic liquid crystal E71. The middle layer is high density. Polyethylene compound layer 2 (sealing the waveguide filled with liquid crystal), and the outer layer is a low-loss metal layer 3. By adjusting the external magnetic field, the effective refractive index of the filled nematic liquid crystal molecules is changed and the frequency band of the non-Bragg forbidden band is adjusted, thus realizing the function of magnetron switch. That is, the optical switch of the present invention is composed of a metal waveguide with a periodic undulating structure filled with a nematic liquid crystal E7 sensitive to a magnetic field, and both ends of the waveguide are sealed by high-density polyethylene. The liquid crystal filled ...

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Abstract

The invention provides a tunable terahertz magnetic-control photoswitch which is a cylindrical waveguide of a periodical undulating structure, consisting of totally three layers from inside to outside, wherein the inner layer is filled with a nematic liquid crystal E7, the middle layer is a high density polyethylene compound (for sealing the waveguide filled with the liquid crystal), and the outer layer is a low-loss metal, respectively. The undulated height of periodical waveguide wall of the waveguide is Epsilon=0.1*r0 (r0 is an average radius of the cylindrical waveguide of the periodical undulating structure), and the thickness of both the high density polyethylene layer and the low-loss metal layer is 1 micron. The invention utilizes the change of the refractive index of a magnetic field to the nematic liquid crystal E7 to realize the regulation of frequency band of waveguide-generated non-Bragg effect, thereby serving as a switch. The tunable terahertz magnetic-control photoswitch provided by the invention has the advantages of simple preparation technology, convenient operation, and stable performance, as well as quick switching speed, small size, easy integration, and wide tunable range, hence, the tunable terahertz magnetic-control photoswitch has a higher scientific significance and a higher application value.

Description

Technical field [0001] The invention relates to a terahertz wave controllable functional device, in particular to a tunable terahertz magnetron optical switch, which belongs to the field of terahertz wave science and technology. Background technique [0002] Terahertz waves usually refer to electromagnetic waves with a frequency between 0.1 and 10 THz. They are between microwave and infrared radiation in the electromagnetic spectrum. They have unique characteristics that are not available in the two. They are used in security inspections, military radars, and medical imaging. The field shows a wide range of application prospects, especially in communication. Compared with microwave communication, terahertz communication has the advantages of wide transmission bandwidth, small antenna size and strong anti-interference ability. It is suitable for short-distance high-speed communication, space communication and military security In fields such as communications, terahertz optical sw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/09G02F1/29
CPCG02F1/09G02F1/29
Inventor 陶智勇张鹭赵秋玉刘欢徐兰兰徐丹樊亚仙
Owner HARBIN ENG UNIV
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