Double-parameter photonic crystal fiber sensor based on surface plasma resonance

By coating gold film and tantalum pentoxide film on the groove channel of the photonic crystal fiber sensor to stimulate surface plasmon resonance, the problem that traditional sensors are difficult to achieve multi-parameter detection is solved, and high-sensitivity and high-resolution dual-parameter measurement is achieved, which is suitable for biomedical and industrial non-destructive testing.

CN120741409APending Publication Date: 2025-10-03南宁桂电电子科技研究院有限公司 +1
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Patent Information

Application Number
CN202510655510.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-21
Publication Date
2025-10-03

AI Technical Summary

Technical Problem

Traditional optical sensors have difficulty achieving multi-parameter detection in complex environments, especially in biomedical testing and industrial monitoring, where the need to simultaneously track changes in multiple physical quantities is unmet.

Method used

A dual-parameter photonic crystal fiber sensor based on surface plasmon resonance is designed. By coating the groove channel surface with gold film and tantalum pentoxide film, the SPR effect is stimulated, the resonance effect is enhanced, and the sensitivity and resolution of the sensor are improved.

Benefits of technology

It realizes dual-channel sensing of the refractive index of the analytical liquid to be tested and the temperature of the thermosensitive liquid. The sensitivity and resolution are better than those of existing sensors and are suitable for biomedical and industrial non-destructive testing.

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Abstract

The invention relates to the technical field of optical fiber sensors, in particular to a double-parameter photonic crystal optical fiber sensor based on surface plasma resonance, which comprises a fiber core and a perfect matching layer coated outside the fiber core, and circular air holes with different sizes are symmetrically distributed in the fiber core; the fiber core is provided with double groove channels, the surface of the upper groove channel is coated with a gold film, and the surface of the lower groove channel is coated with a gold film and a tantalum pentoxide film. According to the invention, dual-channel sensing and dual-parameter measurement can be realized, the refractive index range of an analysis liquid sample to be measured is 1.38-1.4, and the sensitivity of 5000nm / RIU and the resolution of 2 * 10 <-5 > RIU can be obtained; the temperature measurement range of the temperature-sensitive liquid is 20-40 DEG C, and the sensitivity of 4.2 nm / DEG C and the resolution of 0.024 DEG C can be obtained. The sensitivity and the resolution ratio of the sensor are superior to those of an existing sensor, and the sensor has great application prospects in the fields of biomedicine, industrial nondestructive testing and the like.
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