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Terahertz polarization beam splitter

A polarizing beam splitter and terahertz technology, applied in the field of terahertz coupling devices, can solve the problems of reducing material absorption loss, difficult to control, difficult to manufacture, etc., and achieve the effects of reducing absorption loss, reducing transmission loss, and shortening length

Inactive Publication Date: 2014-03-19
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.
Shanshan Li et al. [Shanshan Li, et al., "Terahertz polarization splitter based on orthogonal microstructure dual-core photonics crystal fiber," Apply Optics, 2013, 52, 3305] proposed a dual-core THz wave splitter based on the coupling principle, Because the fiber core is porous, the core mode energy can be effectively distributed in the air, which reduces the material absorption loss, and the core mode transmission is based on the principle of total internal reflection, and the 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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  • Terahertz polarization beam splitter
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  • Terahertz polarization beam splitter

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Embodiment 1

[0026] THz polarizing beam splitter structure such as figure 1 Shown, the air refractive index n air =1.0, the fiber matrix material is selected as polytetrafluoroethylene, its refractive index n=1.5, the material absorption loss is selected as 130dB / m, the width of the rectangular polytetrafluoroethylene d=30μm, the inner diameter of the polytetrafluoroethylene tube D=4000μm, the width of the PTFE tube is 500μm, and the distance between the two cores is D 1 . At a frequency of 1 THz, the coupling length of the x-polarized mode varies with D 1 changes such as figure 2 As shown, with D 1 The increase of x polarization mode coupling length becomes longer, that is, the length of the polarization beam splitter becomes longer. The reason is that with D 1 The mode field overlap area of ​​the x-polarized modes in the two cores decreases with increasing. in D 1 =1000μm, image 3 , Figure 4 , Figure 5 and Figure 6The electric field intensity distribution diagrams of the...

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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 to 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-...

Claims

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Application Information

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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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