Opt Lett. 2023 Feb 1;48(3):727-730. doi: 10.1364/OL.481176.
The sensitivity of one-dimensional Bloch surface wave (BSW) sensors to external refractive index variations using Kretschmann's configuration is calculated analytically by employing first-order perturbation theory for both TE and TM modes. This approach is then validated by comparison with both transfer matrix method simulations and experimental results for a chosen photonic crystal structure. Experimental sensitivities of (8.4±0.2)×10 and (8.4±0.4)×10 nm/RIU were obtained for the TE and TM BSW modes, corresponding to errors of 0.02% and 4%, respectively, when comparing with the perturbation theory approach. These results provide interesting insights into photonic crystal design for Bloch surface wave sensing by casting light into the important parameters related with sensor performance.
采用一阶微扰理论，对 TE 和 TM 两种模式分别进行计算，分析了基于 Kretschmann 配置的一维布喇格表面波（BSW）传感器对外界折射率变化的灵敏度。通过与转移矩阵方法模拟和选定光子晶体结构的实验结果进行比较，验证了该方法的有效性。实验得到 TE 和 TM BSW 模式的灵敏度分别为（8.4±0.2）×10 和（8.4±0.4）×10 nm/RIU，与微扰理论方法相比，误差分别为 0.02%和 4%。这些结果为布喇格表面波传感的光子晶体设计提供了有趣的见解，为传感器性能相关的重要参数提供了新的研究思路。
