Wu Tiesheng, Liu Yumin, Yu Zhongyuan, Peng Yiwei, Shu Changgan, Ye Han
Opt Express. 2014 Apr 7;22(7):7669-77. doi: 10.1364/OE.22.007669.
A surface plasmon polaritons (SPPs) refractive index sensor which consists of two metal-insulator-metal (MIM) waveguides coupled to each other by a ring resonator is proposed. The transmission properties are numerically simulated by finite element method. The sensing characteristics of such structure are systematically analyzed by investigating the transmission spectrum. The results indicate that there exist three resonance peaks in the transmission spectrum, and all of which have a linear relationship with the refractive index of the material under sensing. Through the optimization of structural parameters, we achieve a theoretical value of the refractive index sensitivity as high as 3460nmRIU(-1). Furthermore, this structure can also be used as a temperature sensor with temperature sensitivity of 1.36nm/°C. This work paves the way toward sensitive nanometer scale refractive index sensor and temperature sensor for design and application.
提出了一种表面等离激元极化激元（SPPs）折射率传感器，它由两个通过环形谐振器相互耦合的金属-绝缘体-金属（MIM）波导组成。采用有限元法对其传输特性进行了数值模拟。通过研究传输光谱，系统地分析了这种结构的传感特性。结果表明，传输光谱中存在三个共振峰，并且所有共振峰与被传感材料的折射率都呈线性关系。通过优化结构参数，我们实现了高达3460nmRIU⁻¹的折射率灵敏度理论值。此外，这种结构还可以用作温度传感器，温度灵敏度为1.36nm/°C。这项工作为灵敏的纳米级折射率传感器和温度传感器的设计与应用铺平了道路。
