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High-birefringence sub-wavelength porous T-Hz optical fiber

A high birefringence, sub-wavelength technology, applied in the field of terahertz optical waveguide, can solve the problem of large loss and achieve the effect of high birefringence and low transmission loss

Inactive Publication Date: 2010-07-28
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

One is that the center of the fiber is a high refractive index dielectric material. The photonic crystal fiber with this structure has a wide bandwidth, but the loss is relatively large
Another type of fiber has an air hole structure in the center. This photonic crystal fiber uses the photonic crystal bandgap effect to transmit terahertz waves. Although the loss is low, it can only achieve narrow-band terahertz transmission.

Method used

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  • High-birefringence sub-wavelength porous T-Hz optical fiber
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  • High-birefringence sub-wavelength porous T-Hz optical fiber

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Embodiment Construction

[0026] In this embodiment, as figure 1 As shown, the cladding 101 of the designed high birefringence subwavelength porous terahertz optical fiber is air, and the base material of the fiber core 102 is polytetrafluoroethylene. Its refractive index at 0.5THz is 1.5 and the loss is 0.3 / cm. The arrangement of the air holes 103 and 104 in the core is as follows figure 1 Shown. In addition to the central circular air hole, the centers of the peripheral air holes can form three regular hexagons centered on the center of the fiber core, and the air holes constituting the innermost regular hexagon are oval air holes. In order to ensure the sub-wavelength size of the optical fiber structure, the diameter of the circular air hole d=0.15λ=90μm, the long axis of the elliptical air hole a=d=90μm, the short axis b=0.5d=45μm, and the hole center spacing Λ=1.25d= 112.5μm, the diameter of the fiber core D=7Λ=787.5μm.

[0027] figure 2 It uses the full vector finite element method to calculate ...

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Abstract

The invention relates to the technical field of T-Hz waveguide and provides a high-birefringence sub-wavelength porous T-Hz optical fiber. An ellipse ventage structure of which the size is much smaller than the wave length is added in an optical fiber core of the high-birefringence sub-wavelength porous T-Hz optical fiber; and the invention has the sub-wavelength mode bound capability while the high birefringence is provided at the T-Hz wave band, and also has high-birefringence property in the wider T-Hz bandwidth. The high-birefringence sub-wavelength porous T-Hz optical fiber can be used for the manufacturing of a sub-wavelength size T-Hz device, thereby being applied in the fields of sensing and detection and communication of T-Hz.

Description

Technical field [0001] The invention relates to the field of terahertz optical waveguides, in particular to a subwavelength porous terahertz fiber with high birefringence. Background technique [0002] Terahertz radiation lies between microwave and infrared radiation in the electromagnetic spectrum, and its oscillation frequency ranges from 0.1 THz to 10 THz. Since the lattice resonance, molecular rotation, vibration resonance, and thermal radiation of dielectric crystals all occur in the terahertz spectrum, terahertz spectrum can be used as an effective means for material characterization and fingerprint identification. In addition, terahertz waves have high spatial and temporal resolution, and strong penetrability. Therefore, terahertz imaging technology will become medical diagnosis, biological research, electronic device inspection, and detection of biological and chemical weapons, drugs, and explosives. Powerful tool. [0003] In order to enable the terahertz system to be mi...

Claims

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Application Information

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IPC IPC(8): G02B6/02
Inventor 郑铮赵欣安琳
Owner BEIHANG UNIV
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