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Probe type refractive index sensor based on surface plasma resonance

A refractive index sensor and surface plasmon technology, applied in the field of optical fiber sensing, can solve the problems of high manufacturing process difficulty and low sensitivity, and achieve the effects of improving sensitivity and reducing the diameter of pores

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

AI Technical Summary

Problems solved by technology

[0005] The invention provides a probe-type refractive index sensor based on surface plasmon resonance, which solves the technical problems of high manufacturing process difficulty and low sensitivity of the refractive index sensor

Method used

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  • Probe type refractive index sensor based on surface plasma resonance
  • Probe type refractive index sensor based on surface plasma resonance
  • Probe type refractive index sensor based on surface plasma resonance

Examples

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example 1

[0031] Use 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 n of the core mode and surface plasmon mode at different wavelengths eff , the effective refractive index curves of the two and the imaginary part of the core mode Im(n eff ) Characterized by the loss characteristic diagram as shown in image 3 As shown, the refractive index to be measured is set to 1.413 at this time, and a resonant loss peak W is generated in the output spectrum 1 .

example 2

[0033] Change the refractive index of the sample to be measured, using image 3 According to the judgment method shown, the loss curve of the core mode of the fiber under different refractive indices is obtained, and the peak wavelength is read. After simulation calculation, a series of corresponding resonance wavelength data under different refractive indices are obtained. According to the obtained data, the wavelength-refractive index curve can be drawn by using Origin drawing software. The present invention can realize the refractive index transmission in the range of 1.39-1.42. sense, after data fitting, the curve is as Figure 4shown. It can be seen from the figure that the resonance wavelength is proportional to the increase of the refractive index of the liquid to be measured. According to the sensitivity calculation formula, S=θλ / θn, the sensitivity of the refractive index sensing structure can be calculated to be 10315nm / RIU. When actually measuring the refractive ...

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Abstract

The invention discloses a probe type refractive index sensor based on surface plasma resonance, comprising a photonic crystal fiber, wherein one end of the photonic crystal fiber is connected with a single mode fiber, the other end is plated with a reflecting layer, and one end of the photonic crystal fiber plated with the reflecting layer is in contact with a sample to be tested; an outer surfaceof the photonic crystal fiber is plated with a metal thin film layer; a plurality of air holes are formed in the photonic crystal fiber, and the air hole pass through two end faces of the photonic crystal fiber; and the air holes are periodically arranged in the photonic crystal fiber in a regular hexagon and are arranged from the center of the photonic crystal fiber outward in multiple layers, and the apertures of the air holes in the horizontal direction are smaller than those of the air holes. The outer surface of the PCF is plated with metal thin film silver, the SPR effect is used as a refractive index sensing mechanism, and the performance of the sensor in the coating mode can be ensured by reducing the diameters of the air holes in the horizontal direction. Since the outer surfaceof the PCF is plated with the metal thin film silver, the difficulty of the manufacturing process is also reduced.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to a probe-type refractive index sensor based on surface plasmon resonance. Background technique [0002] The optical refractive index sensor is the product of the interdisciplinary combination of optics, electromagnetism, and microelectronics. It is currently widely used in biochemical physics, molecular detection, pharmaceutical development, food safety, and environmental monitoring. The refractive index of the measured object can indirectly realize the detection of various information including sample composition, concentration, biomolecular interaction and dynamic change process; while photonic crystal fiber has controllability in structure manufacturing, and diversity and flexibility in sensor design. Flexibility, so the photonic crystal fiber (Photonic Crystal Fiber, PCF) based sensor has certain good performance. [0003] Surface Plasmon Resonance (SPR) is a ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/41G01N21/552
CPCG01N21/41G01N21/553
Inventor 施伟华范雨艳吴倩
Owner NANJING UNIV OF POSTS & TELECOMM
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