In this paper, we report a design of a truncated one-dimensional photonic crystal (1DPhC) comprising six bi-layers of TiO₂/SiO₂ with a termination layer of TiO₂ to realize a highly sensitive liquid analyte sensor utilizing Bloch surface wave (BSW) resonances in the spectral domain. We demonstrate that the BSW excitation shows up as a dip for both p- and s-polarized waves. Reflectance response for a p-polarized BSW is due to the spectral interference with maximum depth, and resonance thus obtained is comparable in magnitude with surface plasmon resonance (SPR). In the theoretical analysis, the spectral reflectance, phase difference and its derivative are determined for aqueous solutions of NaCl when the refractive index (RI) is changed in a range of 1.3330–1.3482. We revealed that the BSW resonances for the p-polarized wave give a sensitivity of 1602 nm per RI unit (RIU) and figure of merit (FOM) of 106 RIU⁻¹, respectively. For an s-polarized BSW, they are increased to 1933 nm/RIU and 434 RIU⁻¹, respectively. Moreover, the theoretical results are experimentally verified, and very good agreement is confirmed. The spectral responses for aqueous solutions of NaCl with the RI up to 1.3547 give for the p-polarized BSW a sensitivity of 2022 nm/RIU and FOM of 109 RIU⁻¹, respectively, and using the spectral derivative of the BSW phase difference, the FOM is increased to 301 RIU⁻¹. BSW based sensors with responses in both polarizations thus represent an effective alternative to SPR sensors with advantages including a higher FOM and mechanical robustness.

在本文中，我们报告了一种截断的一维光子晶体 (1DPhC) 的设计，该晶体包括六个双层 TiO ₂ /SiO ₂和一个 TiO ₂终止层，以实现利用 Bloch 表面波的高灵敏度液体分析物传感器。 BSW) 谱域中的共振。我们证明 BSW 激发表现为p和s极化波的下降。p 的反射响应极化 BSW 是由于最大深度的光谱干扰，因此获得的共振在幅度上与表面等离子体共振 (SPR) 相当。在理论分析中，当折射率 (RI) 在 1.3330-1.3482 范围内变化时，NaCl 水溶液的光谱反射率、相位差及其导数是确定的。我们揭示了p偏振波的 BSW 共振分别给出了每 RI 单位 (RIU) 1602 nm 的灵敏度和 106 RIU ^-1的品质因数 (FOM) 。对于s偏振 BSW，它们增加到 1933 nm/RIU 和 434 RIU ^-1， 分别。此外，理论结果得到了实验验证，并证实了非常好的一致性。对 RI 高达 1.3547 的 NaCl 水溶液的光谱响应分别为p偏振BSW 提供了 2022 nm/RIU 的灵敏度和 109 RIU ^{-1 的}FOM ，并且使用 BSW 相位差的光谱导数， FOM 增加到 301 RIU ^-1。因此，具有两种极化响应的基于 BSW 的传感器代表了 SPR 传感器的有效替代品，其优点包括更高的 FOM 和机械鲁棒性。