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Adjustable photonic crystal optical fiber terahertz waveguide

A photonic crystal fiber and terahertz technology, which is applied in the direction of optical waveguide, light guide, cladding fiber, etc., can solve the problems of terahertz waveguide and can no longer change the transmission characteristics, and achieve the effect of easy preparation, saving manpower and material resources

Inactive Publication Date: 2011-08-24
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the transmission characteristics of the conventional photonic crystal fiber cannot be changed after the fabrication is completed, and to provide an adjustable photonic crystal fiber terahertz waveguide that can flexibly control its transmission characteristics without changing the structure of the photonic crystal fiber

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  • Adjustable photonic crystal optical fiber terahertz waveguide
  • Adjustable photonic crystal optical fiber terahertz waveguide
  • Adjustable photonic crystal optical fiber terahertz waveguide

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Embodiment 1

[0019] Such as figure 1 A schematic cross-sectional view of a tunable photonic crystal fiber terahertz waveguide is shown. The cladding 1 is composed of plastic material and air holes 2 arranged periodically in a triangle. The air hole in the center of the cladding is used as the core 3, and the radius r of the air hole 2 is 0.25 mm , air hole spacing , core diameter d=0.8 mm . The fiber core is filled with temperature-sensitive nematic liquid crystal 5CB. When filling, the long axis direction of the molecule is along the direction of the fiber axis, such as figure 2 .

[0020] The plastic material used for the cladding is polyethylene with a refractive index of 1.5. The refractive index experienced by the light propagating in this filling mode is the ordinary refractive index of the liquid crystal. The working temperature of liquid crystal is 25°C-34°C, within the frequency range of 0.2-1.0THz and within this temperature range, the ordinary refractive index range of ...

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Abstract

The invention relates to an adjustable photonic crystal optical fiber terahertz waveguide, which comprises a coating consisting of a plastic material and air holes formed in a triangular period. The air hole in the center of the coating is used as a fiber core. The radius of the fiber core is greater than the radii of the other air holes in the coating. Nematic liquid crystals sensitive to the temperature are filled in the fiber core. The refractive index of the liquid crystals is greater than the refractive index of the coating. The refractive index of the liquid crystals can be changed by controlling the temperature of the working environment of the liquid crystals, so that a propagation mode, an effective mode field area and a zero dispersion range of an optical fiber are flexibly controlled. The defect that when the conventional photonic crystal optical fiber waveguide is produced, the optical properties and the transmission characteristics of the conventional photonic crystal optical fiber waveguide cannot be changed is overcome. A structure parameter of a photonic crystal optical fiber for the terahertz waveguide is at the millimeter order of magnitude. Compared with a visible light or infrared band photonic crystal optical fiber, the photonic crystal optical fiber for the terahertz waveguide is easier to prepare.

Description

technical field [0001] The invention relates to a hollow plastic photonic crystal fiber, in particular to a temperature-adjustable photonic crystal fiber terahertz waveguide. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency between 0.1THZ and 10THZ and a wavelength between 0.03mm and 3mm. It overlaps millimeter waves at long wavelengths and infrared at short wavelengths. The special position of THz wave makes THz technology a bridge connecting electronics and photonics, which has very important academic and application value. Due to the large transmission loss of terahertz waves in free space, waveguide-based terahertz devices are the key to the wide application of terahertz waves. [0003] Photonic crystal fiber is a new type of optical fiber. Compared with ordinary optical fiber, photonic crystal fiber has many advantages: such as unlimited single-mode characteristics, low loss characteristics, flexible dispersion characterist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/10G02B6/02
Inventor 任广军吕蕾刘蓓吴玉登
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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