Terahertz porous fiber evanescent wave sensing device

Abstract

Disclosed is a terahertz fiber evanescent wave sensing device. A fiber core is made of a polymethyl methacrylate material, sub-wavelength air holes which are axially arrayed in a regular-triangularly periodic manner are uniformly distributed in the fiber core, a cladding consists of to-be-detected gas or to-be-detected liquid positioned on the outside of the fiber core, and the sensing characteristic is realized by the aid of evanescent waves at an interface of the fiber core and the cladding. The terahertz porous fiber evanescent wave sensing device has the advantages that a series of sub-wavelength air holes which are axially arrayed in the regular-triangularly periodic manner are additionally disposed in the solid fiber core of the sensing device, the effective refractivity of a fundamental mode is effectively reduced, absorption loss and waveguide dispersion of the material are reduced, relative sensitivity is improved, a fiber can be used as a sensor probe without any treatment when used for sensing the evanescent waves, mechanical reliability is high, processing cost is low, detection time is relatively shortened when the sensing device is used for a sensing area positioned on the outside of the fiber, the surface of the fiber can be treated conveniently when the fiber is used for biological fluorescent detection, and reliability of the probe cannot be affected.

Description

technical field [0001] The invention relates to a special core plastic holey optical fiber, in particular to a terahertz holey optical fiber evanescent wave sensor device. Background technique [0002] Terahertz waves are between millimeter waves and infrared radiation, in the transition zone from macroscopic classical theory to microscopic quantum theory, and also in the transition field from electronics to photonics. within 3mm. Terahertz waves have many superior characteristics, and have been widely used in object imaging, spectral analysis, medical diagnosis, material analysis and testing, environmental detection, and communication radar and other fields. In recent years, terahertz research has become hot internationally, and terahertz waveguides and sensor devices with various functions have emerged as the times require. [0003] Hole fiber is a series of new fibers developed on the basis of traditional hole fiber and photonic crystal fiber, including photonic bandgap...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of large loss, large dispersion and low sensitivity of the traditional optical fiber evanescent wave sensor in the past, and propose a terahertz porous optical fiber evanescent wave sensor device with low loss, low dispersion and high sensitivity

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