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Terahertz anti-resonance optical fiber polarization modulator

An anti-resonance and regulator technology, which is applied in the directions of instruments, optics, nonlinear optics, etc., can solve the problems of narrow application range and achieve the effects of fast regulation speed, excellent regulation effect and simple structure

Active Publication Date: 2021-04-02
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The existing research on THz polarization control devices is still in its infancy, and most of them use the "sandwich" two-dimensional layer structure for polarization control. Although this structure is simple to manufacture, it is more efficient in use and coupling There are many deficiencies, and the application area is narrow

Method used

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  • Terahertz anti-resonance optical fiber polarization modulator
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Embodiment

[0040] The designed THz anti-resonance fiber control device such asfigure 1 As shown, the diameter D of the air core 4 core is 2 mm; the inner diameter d of the hollow thin-walled tube 2 around the fiber core is 1 mm; the wall thickness a of the hollow thin-walled tube 2 satisfies the anti-resonant period condition:

[0041]

[0042] Among them, λ is the THz wavelength transmitted inside the air core 4, n 1 , n 0 Respectively, the optical fiber material cycloolefin copolymer and the refractive index of air, m is the resonance order (integer), a is 0.078mm in this embodiment, and is used to transmit 2.5THz waves; the thickness T of the tubular outer cladding 1 is 0.5mm; The thickness of the vanadium dioxide film is 1 μm. The modulated laser source is a femtosecond pulsed laser, and the luminous flux is not less than 100μJ / cm 2 .

[0043] The anti-resonant optical fiber used in this embodiment is used for the transmission of 2.5 THz waves. After depositing a vanadium diox...

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Abstract

The invention discloses a terahertz anti-resonance optical fiber polarization modulator, which comprises an anti-resonance optical fiber, a vanadium dioxide film and a pulse modulation laser source, wherein the anti-resonance optical fiber is composed of an air fiber core, hollow thin-walled tubes and a tubular outer wrapping layer, and the hollow thin-walled tubes are evenly distributed on the inner wall of the tubular outer wrapping layer; the hollow thin-walled tubes are not in contact with each other to form a node-free structure, and the hollow thin-walled tubes surround the periphery ofthe air fiber core to serve as an inner cladding; the vanadium dioxide film is deposited on the inner wall of the hollow thin-walled tube; the pulse modulation laser source enters the hollow thin-walled tube through coupling to excite the vanadium dioxide thin film to generate phase change, so that terahertz waves in the air fiber core are polarized; on-off and intensity of pulse lasers in different hollow thin-walled tubes are controlled, and the polarization state of terahertz waves can be regulated and controlled. The HC-ARF-based high-speed waveguide polarization regulation and control device is realized, and the vacancy in the field of polarization regulation and control devices is complemented.

Description

technical field [0001] The invention relates to the technical field of optical fiber control devices, in particular to a terahertz anti-resonance fiber polarization regulator. Background technique [0002] Terahertz (THz) wave is an electromagnetic wave with a frequency of 0.1-10 THz, which is between microwave and infrared light in the spectrum. Because of its special position in the spectrum, it has excellent photonics and electronics properties. THz waves have many unique characteristics, such as high penetration to non-polarized substances, low photon energy, wide bandwidth and large communication capacity. Therefore, THz waves can be widely used in medical imaging, security inspection, environmental monitoring, atmospheric remote sensing, and basic physics research. [0003] Because the water vapor in the atmosphere has a strong absorption of THz waves, the THz waves have a large loss when transmitted in free space and it is difficult to control their transmission dire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01
CPCG02F1/0115G02F1/0126G02F1/0136G02F2203/13
Inventor 史伟闫忠宝孙帅盛泉姚建铨
Owner TIANJIN UNIV
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