Abstract
Abstract A refractive index sensor based on magneto-optical surface plasmon resonance (MOSPR) is proposed. The device is made up of a prism coupling system consists of prism/TiN/SiO2/YIG/CeYIG/Au/liquid. System simulation is performed by 4 × 4 transfer matrix method. It is found that the structure has excellent sensing performance. Magnetron sputtering vacuum coating method is used to fabricate the dielectric film of the sample, and a MOSPR sensor detection platform is built to test the concentration of 0–30% alcohol solution. As the concentration of the alcohol solution increases, the refractive index of the sensing liquid increases and transverse Kerr effect is enhanced. Meanwhile the incident angle corresponds to the maximum value of the MOSPR curve (the difference of reflectance with opposite magnetic fields) also increases with the alcohol concentration. This structure of MOSPR is expected to be applied in the field of micro-measurement and biochemical sensing.
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