A Refractive Index Sensor Based on Magneto-Optical Surface Plasmon Resonance

A surface plasmon and refractive index sensor technology, applied in the field of optical sensing, can solve the problems of insufficient figure of merit of MO-LSPR devices, and achieve the effects of high stability, improved quality factor, and high magneto-optical effect
CN109900659BActive Publication Date: 2022-05-03UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
UNIV OF ELECTRONICS SCI & TECH OF CHINA
Publication Date
2022-05-03

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Abstract

The invention belongs to the field of optical sensing, in particular to a refractive index sensor based on magneto-optic surface plasmon resonance. The present invention carries out structural design by designing the dielectric layer, and builds a three-layer structure of a continuous metal thin film layer, a Ce:YIG thin film and a noble metal periodic structure, thereby realizing localized surface plasmons of noble metal nanoparticles and a continuous metal thin film layer / Ce: The propagating surface plasmon resonance coupling at the YIG interface uses the Ce:YIG thin film material, which has lower optical loss in the visible and near-infrared bands than ferromagnetic metal materials, and has a higher magneto-optical effect and High stability; the scattering loss of localized plasmon resonance is significantly reduced, and the magneto-optical effect is significantly enhanced. Using the strong magneto-optical effect of magneto-optic oxide, the device quality factor reaches 2200RIU ‑1 .
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Description

technical field

[0001] The invention belongs to the field of optical sensing, in particular to a refractive index sensor based on magneto-optic surface plasmon resonance. Background technique

[0002] Surface Plasmon Resonance (SPR) refers to the collective oscillation generated by the coupling of conduction electrons in metals and incident electromagnetic fields. Among the SPR phenomena, localized plasmon resonance (LSPR) refers to the local resonance phenomenon of free electrons generated by the coupling of electromagnetic waves with subwavelength metal particles. Since LSPR is highly sensitive to the composition, shape, size, and local dielectric environment of nanoparticles, it can be applied as a label-free and highly sensitive sensor for measuring environmental changes and biomolecular interactions. At the same time, due to the small size of the LSPR structure, chemical-biological sensing with high spatial resolution can be realized. However, due to the wide resonant...

Claims

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