A terahertz anti-resonance 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, simple structure and excellent regulation effect
Active Publication Date: 2021-12-10
TIANJIN UNIV
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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
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[0040] The designed THz anti-resonant 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 dioxi...
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Abstract
The invention discloses a terahertz anti-resonant optical fiber polarization regulator, comprising: an anti-resonant optical fiber, a vanadium dioxide film and a pulse-modulated laser source; Composition, the inner wall of the tubular outer cladding evenly distributes the hollow thin-walled tubes; the hollow thin-walled tubes are not in contact with each other to form a nodeless structure, and the hollow thin-walled tubes surround the air fiber The periphery of the core is used as an inner cladding; the vanadium dioxide film is deposited on the inner wall of the hollow thin-walled tube; the pulse-modulated laser source is coupled into the hollow core thin-walled tube to excite the phase change of the vanadium dioxide film , so that the terahertz wave in the air core is polarized; the on-off and intensity of the pulsed laser in different hollow-core thin-walled tubes can be controlled to adjust the polarization state of the terahertz wave. The invention realizes the high-speed waveguide polarization control device based on HC-ARF, and fills up the vacancy in the field of polarization control devices.
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...
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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