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Biological two-parameter sensor based on photonic crystal fiber

A photonic crystal fiber and dual-parameter technology, which is applied in the field of biosensing, can solve the problems of single detection parameter and low sensitivity of biosensors, and achieve the effect of safe signal transmission, high sensitivity and good stability

Inactive Publication Date: 2019-11-12
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a biological dual-parameter sensor based on photonic crystal fiber, which solves the technical problem of single detection parameter and low sensitivity of the biological sensor

Method used

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  • Biological two-parameter sensor based on photonic crystal fiber
  • Biological two-parameter sensor based on photonic crystal fiber
  • Biological two-parameter sensor based on photonic crystal fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Use the COMSOL Multiphysics simulation software to establish a photonic crystal fiber geometric model and perform numerical simulation and mode analysis, and record the effective refractive index neff of the core mode at different wavelengths, and the loss characteristics represented by its imaginary part Im(neff) are as follows image 3 As shown, the ambient temperature is set at 20°C, and the refractive index of the biological fluid to be tested is 1.37. Two resonant loss peaks W1 and W2 are generated in the output spectrum, and the loss peak W1 is smeared with the The result of the plasmon resonance channel on the coated gold surface of the biological fluid is used to detect the concentration of the biological fluid to be measured; the loss peak W2 is the result of the directional coupling channel of the photonic crystal fiber core filled with a temperature-sensitive medium, which is used for temperature detection .

example 2

[0034] Such as Figure 4 As shown, when the external temperature is 20°C, the loss of the core guided mode varies with the wavelength under different refractive indices of the same biological liquid to be tested. By comparison, it is found that when the refractive index of the liquid to be tested changes from 1.34 to 1.37, the resonance loss peak moves to the short wavelength direction with the increase of the refractive index, and a blue shift occurs, and the loss peak increases slightly. A, B, C, D and E represent the resonance peaks under different refractive indices of the same liquid to be measured, respectively. The resonance wavelength λr corresponding to the resonance loss peak is more sensitive to the change of the refractive index of the liquid to be tested. Therefore, by using this characteristic, the change of the refractive index of the liquid to be tested can be analyzed by comparing the drift of λr, and then the change of the concentration of the liquid to be te...

example 3

[0036] Figure 6 It shows the relationship between the resonant wavelength and the refractive index of the liquid to be measured. It can be found that the resonant wavelength and the refractive index of the liquid to be measured are in good linearity and sensitivity when the plasmon resonance of the coated gold surface coated with the liquid to be measured is 1.34 to 1.37. Sensitivity in the range of refractive index changes up to

[0037]

[0038] where S RIU is the sensitivity under the condition of refractive index, λ is the wavelength, and RIU is the refractive index.

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Abstract

The invention discloses a biological two-parameter sensor based on a photonic crystal fiber. The biological two-parameter sensor comprises a D type photonic crystal fiber and single mode fibers, wherein the single mode fibers are in fusion welding at the two ends of the D type photonic crystal fiber. The D type photonic crystal fiber comprises a photonic crystal fiber; one side of the photonic crystal fiber is a polishing and grounding surface; a metal layer is plated on the polishing and grinding surface; a plurality of air holes are formed in the photonic crystal fiber; the air holes penetrate through two end surfaces of the photonic crystal fiber; and any one air hole is filled with a temperature-sensitive medium. The film plating gold surface plasma resonance effect is used as a refractive index sensing mechanism; the directional coupling effect and the temperature-sensitive effect of the D type photonic crystal fiber are used as temperature sensing mechanisms; two mutually separated resonance loss peaks are generated in a fiber output spectrum; and the high-sensitivity two-parameter sensing of the concentration and the temperature of biological liquid to be tested is realized.The sensor has higher sensitivity by optimizing the air hole layer number and hole diameter of the photonic crystal fiber and the film plating gold thickness.

Description

technical field [0001] The invention belongs to the technical field of biological sensing, in particular to a biological dual-parameter sensor based on a photonic crystal fiber. Background technique [0002] Photonic crystal fiber (PCF), also known as microstructured fiber (MSF), has attracted widespread attention in recent years. According to its light guiding mechanism, it can be divided into refractive index light-guiding (TIR) ​​photonic crystal fiber and photonic bandgap light-guiding ( PBG) photonic crystal fiber. It is usually composed of periodic arrangements of air holes and dielectric columns. The periodic structure in PCF makes it present many characteristics that are difficult to achieve with ordinary optical fibers, such as endless single-mode transmission, high nonlinearity, large mode area, adjustable dispersion, and low loss. , high birefringence and other characteristics. [0003] A sensor is a detection device that can sense the measured information and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/41G01N21/552G01K11/32
CPCG01N21/41G01N21/553G01K11/32G01N21/4133
Inventor 施伟华张凌
Owner NANJING UNIV OF POSTS & TELECOMM
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