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A Photonic Crystal Fiber Sensor with Pentagonal Arrangement

A technology of photonic crystal fiber and pentagon, which is applied in the direction of cladding fiber, optical waveguide and light guide, instrument, etc., can solve the problems of low sensing detection sensitivity, single sensor structure, not easy to prepare, etc., and achieve simple design structure, high sensitivity, easy to prepare effects

Active Publication Date: 2020-03-31
河北科讯通信器材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on the application of the theory of metal-induced surface plasmon resonance in photonic crystal fiber sensors, researchers have made many achievements, but there are still some problems, such as: the structure design of photonic crystal fiber is too complicated, it is not easy to prepare; analyte refraction The detectable range of the rate is narrow; the sensitivity of the sensor detection is low; the designed sensor has a single structure and cannot provide alternatives, etc.
These have greatly limited the application range and functions of photonic crystal fiber optic sensors, and it is imminent to seek a breakthrough

Method used

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  • A Photonic Crystal Fiber Sensor with Pentagonal Arrangement
  • A Photonic Crystal Fiber Sensor with Pentagonal Arrangement
  • A Photonic Crystal Fiber Sensor with Pentagonal Arrangement

Examples

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Embodiment 1

[0059] This embodiment adopts figure 1 The photonic crystal fiber sensor shown in a pentagonal arrangement is called the first sensor for short.

[0060] Figure 4 for figure 1 Schematic diagram of the front view of the three-dimensional structure. The photonic crystal fiber of the present invention is composed of base material 1 , cladding air holes and gold nanowires 4 . Figure 4 Among them, the air hole layout is a pentagon with the inner and outer layers inverted, the air hole 2 in the inner layer is smaller, and the air hole 3 in the outer layer is larger in size; the uppermost air hole in the cladding is the main sensing channel, and all of them are filled with the liquid to be measured; Gold nanowires 4 are fixed at the bottom of the inner wall of the second air hole 32, which is used as an induction material for surface plasmon resonance effect; the air hole is circular.

[0061] Dislocation fusion splicing of the solid traditional single-mode optical fiber and th...

Embodiment 2

[0075] This embodiment provides a D-shaped photonic crystal fiber sensor prepared based on photonic crystal fiber side polishing technology, referred to as the second sensor.

[0076] Figure 9a It is a schematic diagram of the optical fiber end face structure when the second air hole of the present invention is circular, which is the structure given in Example 1; Figure 9b for in Figure 9a Basically, the schematic diagram of the D-shaped optical fiber end face structure when the second air hole formed by side polishing is fan-shaped, and the polishing depth of the optical fiber is required to be h=3 μm or h=4 μm, which is the optical fiber structure used in Example 2.

[0077] Combine below Figure 2b brief introduction Figure 9b The preparation method of optical fiber sensor. Specifically: firstly, the optical fiber preforms are arranged into a pentagonal structure by stacking method, and then drawn into Figure 9a The second air hole shown is a circular photonic cry...

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Abstract

The invention discloses a photonic crystal optical fiber sensor distributed in a pentagon shape. The photonic crystal optical fiber sensor comprises a base material, cladding air holes, gold nanowiresand to-be-tested liquid; quartz serves as the base material; the air holes are formed into the inner layer and the outer layer and distributed in mutually-inverse pentagon shapes; the hole diameter of of the outer layer is larger than that of the inner layer; the air holes of the inner layer are compact and mainly used for limiting transmission of light beams in a fiber core; the air holes of theouter layer are dispersed, and used for changing the relative refraction index of a cladding layer and adjusting the properties of optical fibers; the second air holes of the outer layer are circularor fan-shaped, and the gold nanowires are fixed to the bottoms of the second air holes and used as inducing materials for the occurrence of the surface plasma resonance effect. The photonic crystal optical fiber sensor is simple in optical fiber structure design; when the sensor is operated, on the premise of guaranteeing high sensitivity and a high resolution rate, different implementation schemes can be flexibly selected aiming at different experiment conditions, and preparation is facilitated.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to a photonic crystal optical fiber sensor arranged in a pentagon. Background technique [0002] Surface plasmon resonance (SPR) in optical fiber is a remarkable optical phenomenon, which is caused by incident light excitation of conduction electrons at the interface between metal and dielectric medium. This effect is caused by the coupling between the evanescent field formed by the incident light and the free electrons on the metal surface. When the effect occurs, it will be accompanied by the generation of surface plasmon waves and the sharp increase of core mode loss. Since the waves are at the boundary of conductors and dielectrics, these oscillations are very sensitive to any changes in the refractive index near the boundary, making surface plasmon resonance a very promising means of sensing. [0003] Due to the advantages of high sensitivity, real-time and label-free moni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/552G02B6/02
CPCG01N21/554G02B6/02347G02B6/02361
Inventor 李建设郭英李曙光
Owner 河北科讯通信器材有限公司
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