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A SPR low-refractive index sensor based on negative curvature photonic crystal fiber

A photonic crystal fiber, low refractive index technology, applied in the fields of special fiber, fiber sensing, signal processing, can solve the problem of low sensitivity of the sensor, and achieve the effect of simple structure, easy fabrication and high sensitivity of the device

Active Publication Date: 2021-05-11
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The problem to be solved by the present invention is to overcome the problem of low sensor sensitivity in the range of low refractive index

Method used

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  • A SPR low-refractive index sensor based on negative curvature photonic crystal fiber
  • A SPR low-refractive index sensor based on negative curvature photonic crystal fiber
  • A SPR low-refractive index sensor based on negative curvature photonic crystal fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The schematic diagram of the cross-section of the SPR low-refractive index sensor based on the negative curvature photonic crystal fiber is shown in figure 1 shown. The specific structure is: the base of the photonic crystal fiber is 1, the core 2 of the photonic crystal fiber is surrounded by two layers of air walls 3 and 4, each layer of air wall is composed of six fan-shaped rings with the same negative curvature, and the cladding of the photonic crystal fiber The outer wall is coated with metal 5, and the outside of the metal is covered by the substance to be measured 6. The thickness, distance, and angle of the fan-shaped ring in the two-layer air wall of the proposed photonic crystal fiber can be adjusted, and the metal material coated on the outer wall of the photonic crystal fiber cladding May include: gold, silver, ITO and alumina.

[0018] When the external refractive index is 1.33, the effective refractive index and loss of the two polarization states X and ...

Embodiment 2

[0020] The schematic diagram of the cross-section of the SPR low-refractive index sensor based on the negative curvature photonic crystal fiber is shown in figure 1 shown. The specific structure is: the base of the photonic crystal fiber is 1, the core 2 of the photonic crystal fiber is surrounded by two layers of air walls 3 and 4, each layer of air wall is composed of six fan-shaped rings with the same negative curvature, and the cladding of the photonic crystal fiber The outer wall is coated with metal 5, and the outside of the metal is covered by the substance to be measured 6. The thickness, distance, and angle of the fan-shaped ring in the two-layer air wall of the proposed photonic crystal fiber can be adjusted, and the metal material coated on the outer wall of the photonic crystal fiber cladding May include: gold, silver, ITO and alumina.

[0021] In this implementation case, under different refractive indices, the loss curve diagram of the sensor is as follows ima...

Embodiment 3

[0023] The schematic diagram of the cross-section of the SPR low-refractive index sensor based on the negative curvature photonic crystal fiber is shown in figure 1 shown. The specific structure is: the base of the photonic crystal fiber is 1, the core 2 of the photonic crystal fiber is surrounded by two layers of air walls 3 and 4, each layer of air wall is composed of six fan-shaped rings with the same negative curvature, and the cladding of the photonic crystal fiber The outer wall is coated with metal 5, and the outside of the metal is covered by the substance to be measured 6. The thickness, distance, and angle of the fan-shaped ring in the two-layer air wall of the proposed photonic crystal fiber can be adjusted, and the metal material coated on the outer wall of the photonic crystal fiber cladding Including: gold, silver, ITO and alumina.

[0024] In this implementation case, when the external refractive index is in the low refractive index range of 1.2-1.33, the reson...

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Abstract

The invention discloses a SPR low-refractive index sensor based on a negative curvature photonic crystal fiber, which is characterized in that: the SPR sensor is based on a photonic crystal fiber structure, the photonic crystal fiber substrate is (1), and the photonic crystal fiber core (2) is composed of Two layers of air walls (3), (4) are formed around, each layer of air walls is composed of six fan-shaped rings with the same negative curvature, and the outer wall of the cladding of the photonic crystal fiber is coated with metal (5), and the metal is composed of the substance to be measured ( 6) Cladding, the metal material has the metal surface plasmon resonance SPR effect, which is coupled with the core mode in the optical fiber, and the loss peak appears at the resonance wavelength. When the external substance to be measured (6) changes, the loss peak wavelength shifts , by observing the wavelength shift, the measurement of the refractive index is realized. The sensor has polarization-independent characteristics and is suitable for the low refractive index range of 1.2-1.33. The sensor sensitivity can reach up to 12000nm / RIU. Important device support.

Description

technical field [0001] The invention relates to an SPR low-refractive index sensor based on a negative curvature photonic crystal fiber, belonging to the fields of special optical fiber, optical fiber sensing and signal processing. Background technique [0002] With the development of big data, 5G and the Internet of Things, the concept of "Internet of Everything" has been proposed, which will provide great convenience for production development and daily life, and become an inevitable trend of future communication development. The realization of "Internet of Everything" is inseparable from the sensing technology for intelligent monitoring of objects. Due to its small size, anti-electromagnetic interference, and various structures, fiber optic sensors have become an important member of the sensor field and have been widely used in military manufacturing, biochemistry, and environmental monitoring. [0003] There are various structures of fiber optic sensors, including: fibe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/41
Inventor 裴丽王建帅王吉吴良英
Owner BEIJING JIAOTONG UNIV
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