Opt Lett. 2018 Sep 1;43(17):4216-4219. doi: 10.1364/OL.43.004216.
We report an optofluidic resonator refractive index sensor based on an integrated structure constructed by a free-space coupling architecture. It uses a symmetrical metal-cladding hollow-core waveguide and a prism to generate surface plasmon polarization. The sensor achieves very high sensitivity by coupling the core mode to ultrahigh-order modes in the waveguide layer that can obtain a refractive index of a detailed low-order value of 1×10. We demonstrate the device through infiltration of different fluids into the hollow core along an optofluidic resonator. A detection limit of 1.0×10 refractive index units has been derived from measurements. The presented method can be applied to the detection of molecular structures and biochemistry.
我们报告了一种基于集成结构的光流体谐振器折射率传感器，该结构由自由空间耦合架构构建。它使用对称的金属包覆空芯波导和棱镜来产生表面等离子体极化。该传感器通过将芯模耦合到波导层中的超高阶模，实现了非常高的灵敏度，从而可以获得详细的低阶折射率值为 1×10。我们通过将不同的流体渗透到空芯中沿光流体谐振器来演示该器件。从测量中得出的检测限为 1.0×10 折射率单位。所提出的方法可以应用于分子结构和生物化学的检测。
