This work presents a refractive index sensor based on Bloch surface waves (BSW) with high sensitivity and quality factor (Q). The sensor utilizes a one-dimensional photonic crystal TiO2/MgF2 as a distributed Bragg reflector and employs a LiNbO3 thin film as the top defect layer to excite BSW through a Kretschmann prism. Numerical simulations using the rigorous coupled wave analysis method are conducted to explore various prism configurations, revealing that low refractive index prisms yield superior performance for BSW sensors. The designed sensor achieves a sensitivity of 1600 nm/RIU (or 938 °/RIU) and is analyzed for its full-width at half-maximum and quality factor (Q), with the sensor’s Q value reaching 8000 /RIU (or 13595 /RIU). Through manufacturing error analysis, it was found that the designed sensor has good mechanical robustness, is easy to manufacture, and is also easy to integrate. The results show that the LiNbO3 nonlinear tunable material has great application prospects in the field of refractive index sensors.

中文翻译：

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采用 LiNbO3 的高灵敏度和品质因数 Bloch 表面波传感器的设计和优化

这项工作提出了一种基于布洛赫表面波（BSW）的折射率传感器，具有高灵敏度和品质因数（Q）。该传感器采用一维光子晶体 TiO2/MgF2 作为分布式布拉格反射器，并采用 LiNbO3 薄膜作为顶部缺陷层，通过 Kretschmann 棱镜激发 BSW。使用严格的耦合波分析方法进行数值模拟来探索各种棱镜配置，揭示低折射率棱镜为 BSW 传感器带来卓越的性能。设计的传感器实现了1600 nm/RIU（或938°/RIU）的灵敏度，并对其半峰全宽和品质因数（Q）进行了分析，传感器的Q值达到了8000/RIU（或13595/RIU）。 RIU）。通过制造误差分析发现，所设计的传感器具有良好的机械鲁棒性，易于制造，也易于集成。研究结果表明LiNbO3非线性可调谐材料在折射率传感器领域具有巨大的应用前景。