Research on a highly sensitive surface plasmon resonance sensor based on side-polished holey fiber with circle lattice

Using the strong local electromagnetic field enhancement of surface plasmon polaritons (SPP), a highly sensitive surface plasmon resonance (SPR) sensor based on side-polished circle lattice holey fiber (HF) is proposed. The coupling resonance properties of the sensor are numerically studied, and the investigation findings indicate that our proposed sensor can realize single-resonance detection within a wide wavelength range of 1.189–1.921 μm for the refractive index (RI) of the analyte changes from 1.28 to 1.39. The highest wavelength sensitivity, amplitude sensitivity, and RI resolution are up to 21,400 nm/RIU, 363.4 RIU–1, and 4.67 × 10–6 RIU, respectively. Therefore, our proposed sensor will have broad application prospects in RI sensing, including water pollution monitoring, medical treatment, and food safety detection.