Novel high-sensitivity photonic crystal fiber terahertz evanescent wave sensing device

Abstract

A novel high-sensitivity photonic crystal fiber terahertz evanescent wave sensing device is a fiber core cladding structure and comprises a fiber core and a cladding, a high-density polyethylene material is used as a substrate, the fiber core consists of a doped core and six small air holes uniformly distributed on the periphery of the doped core, large air holes which are axially arrayed in a regular-triangularly periodically manner are disposed on the peripheries of the six small air holes of the fiber core, and the large air holes and the substrates around the large air holes form the cladding. The novel high-sensitivity photonic crystal fiber terahertz evanescent wave sensing device has the advantages that the fiber core of a solid photonic crystal fiber is provided with the doped core, and the six small air holes are additionally disposed on the periphery of the fiber core, so that the sensitivity of the photonic crystal fiber terahertz evanescent wave sensing device is obviously improved; and the doped core with a low refractivity is beneficial for reducing the effective refractivity of a fundamental mode and reducing the effective refractivity difference of the fiber core and the cladding, the sensitivity of the sensing device can also be enhanced, and the evanescent wave sensing device has a high application value in terms of detection for gas, toxic biochemical preparation, food safety, air pollution and the like.

Description

technical field [0001] The invention relates to a solid plastic photonic crystal fiber, in particular to a novel high-sensitivity photonic crystal fiber terahertz evanescent wave sensor device. Background technique [0002] Terahertz wave refers to electromagnetic waves with a frequency between 0.1THZ and 10THZ and a wavelength between 0.03mm and 3mm. It occupies a special position in the electromagnetic spectrum. Its long-wave band crosses millimeter waves, and its short-wave band overlaps with infrared rays. It is the transitional area between science technology and photonics technology, microcosm and macrocosm. Due to its advantages such as low quantum energy, high signal-to-noise ratio, extremely wide frequency, and good time-space coherence, it has attracted close attention from scientists in recent years. Terahertz waves are widely used in data transmission, material processing, layered imaging technology, sensing waveguide devices and other fields. [0003] Photonic...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the shortcomings of the previous solid-core photonic crystal fiber evanescent wave sensor, such as low sensitivity and difficult detection of tiny objects, and provide a new type of high-sensitivity photonic crystal fiber terahertz evanescent wave sensor device, which can effectively Improve the sensitivity of the evanescent wave sensor to realize the detection of low concentration and the properties of tiny objects

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