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A terahertz polarizing beam splitter

A polarizing beam splitter and terahertz technology, which is applied in the field of terahertz coupling devices, can solve the problems of reducing material absorption loss, difficult to manufacture, and difficult to control, and achieve the effects of reducing transmission loss, reducing absorption loss, and easy operation

Inactive Publication Date: 2016-01-20
JIANGSU UNIV
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Problems solved by technology

The disadvantage is that these two coupling devices are not easy to control, and any external contact can easily affect the transmission of THz waves in the device.
ShanshanLi et al. [ShanshanLi, et al., "Terahertzpolarization splitter based on orthogonal microstructure dual-corephotonics crystal fiber," ApplyOptics, 2013, 52, 3305] proposed a dual-core THz wave splitter based on the coupling principle. Because the core is porous, the core mode energy can be effectively Distributed in the air, which reduces the material absorption loss, and the fiber core mode transmission is based on the principle of total internal reflection, the fiber core mode transmission is not affected by the external environment, but the structure of this coupling device is complex and difficult to manufacture

Method used

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  • A terahertz polarizing beam splitter
  • A terahertz polarizing beam splitter
  • A terahertz polarizing beam splitter

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Embodiment 1

[0025] THz polarizing beam splitter structure such as figure 1 As shown, the air refractive index nair=1.0, the matrix material of the optical fiber is selected as polytetrafluoroethylene, its refractive index n=1.5, the material absorption loss is selected as 130dB / m, and the width of the rectangular polytetrafluoroethylene d=30 μm, The inner diameter of the polytetrafluoroethylene circular tube is D=4000 μm, the width of the polytetrafluoroethylene circular tube is 500 μm, and the distance between two cores is D1. When the frequency is 1THz, the coupling length of the x-polarized mode varies with D1 as figure 2 As shown, as D1 increases, the x-polarization mode coupling length becomes longer, that is, the length of the polarization beam splitter becomes longer. The reason is that with the increase of D1, the mode field overlap area of ​​the x-polarized mode in the two cores decreases. When D1=1000μm, image 3 , Figure 4 , Figure 5 with Image 6 The electric field in...

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Abstract

The invention discloses a terahertz polarization beam splitter. The terahertz polarization beam splitter comprises three rectangular medium strips and a medium circular tube. The beam splitter is characterized in that a first rectangular medium strip is fixed on an inner wall of the medium circular tube via a central axis of the medium circular tube; a second rectangular medium strip and a third rectangular medium strip are vertical to the first rectangular medium strip respectively and are fixed on the inner wall of the medium circular tube; the second rectangular medium strip and the third rectangular medium strip are symmetrically distributed on two sides of the first rectangular medium strip; an intersecting portion of the first rectangular medium strip, the second rectangular medium strip and the third rectangular medium strip is two fiber cores. The size of each fiber core is less than an operating wavelength. Fiber core conduction mode energy can be mostly distributed in air so that material absorption losses are reduced. Besides, a fiber core conduction mode is effectively restricted around the fiber cores by a fiber cladding; changes of a surrounding environment of the polarization beam splitter do not influence polarization beam splitter performance so that operation is convenient.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to a terahertz coupling device. Background technique [0002] Terahertz (THz) usually refers to electromagnetic waves with a frequency in the range of 0.1-10 THz, and its band is between microwave and infrared in the electromagnetic spectrum. THz radiation has potential applications in many fields, such as communication, sensing, imaging, spectroscopy and medicine. Recently, terahertz wave coupling devices have attracted the attention of scientists at home and abroad. There are three main difficulties in the design of terahertz coupling devices. The first is to make the core conduction mode energy mainly distributed in the air and reduce the material absorption loss; The second is to shorten the length of the coupling device and reduce the transmission loss; the third is to reduce the impact of external environment changes on the transmission of terahertz waves. [Ming-Ya...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/126G02B6/27
Inventor 祝远锋陈明阳张永康杨继昌杨阳刘玥
Owner JIANGSU UNIV
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