A fiber-optic sensor based on magneto-optic surface plasmon resonance

By forming a D-shaped region on a single-mode optical fiber and depositing thin films of metal and magneto-optical materials, combined with an external magnetic field, the shortcomings of traditional optical fiber sensors in terms of detection accuracy and quality factor are solved, and a high-performance optical fiber sensor design is realized.

CN116908144BActive Publication Date: 2026-07-24FUDAN UNIV YIWU RES INST
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Patent Information

Application Number
CN202310670489.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-06-07
Publication Date
2026-07-24
Estimated Expiration
2043-06-07

AI Technical Summary

Technical Problem

Traditional fiber optic sensors based on surface plasmon resonance (SPR) are unable to meet the high performance requirements of modern detection, especially in terms of detection accuracy and quality factor. Furthermore, existing technologies are mainly limited to planar structures and lack MOSPR sensors based on fiber optic structures.

Method used

A D-shaped region is formed on a single-mode optical fiber. The cladding is removed by polishing and a thin film of metal and magneto-optical material is deposited. Combined with an external magnetic field, the change in the wavelength of the resonance peak is detected by MOKE spectroscopy to realize the sensing of the external refractive index.

Benefits of technology

This greatly improves the detection accuracy and sensitivity of fiber optic sensors, enhances the quality factor, and achieves higher detection precision.

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Abstract

The application belongs to the technical field of optical fiber sensing, and particularly relates to a kind of optical fiber sensors based on magneto-optical surface plasmon resonance. The optical fiber sensor is formed by removing the cladding of a single-mode optical fiber through polishing and grinding to form a D-shaped optical fiber region; a metal film and a magneto-optical film are sequentially coated on the plane of the D-shaped optical fiber region to form a D-shaped optical fiber sensing region; a magnetic field is applied in the vertical direction of the optical fiber sensing region; probe light from a broadband light source is input from one end of the single-mode optical fiber, passes through the optical fiber sensing region, is output from the other end of the single-mode optical fiber, and is detected by a spectrometer; when the refractive index of the external environment in contact with the magneto-optical material film changes, the change in the resonance peak wavelength in the MOKE spectrum of the sensor will be caused, and the sensing of the refractive index of the external environment is realized by detecting the resonance wavelength. Compared with the optical fiber SPR sensor, the application greatly improves the quality factor while maintaining high sensitivity, thereby improving the actual detection accuracy of the sensor.
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