The optical sensors are widely used in biological, chemical and food processing industries for refractive index measurement. A novel metal–insulator–metal square ring resonator configuration is introduced where a nano-slit is diagonally positioned on two opposite sides of the square ring and cavity is decorated with a set of silver nanodots. The resonator’s spectral properties are thoroughly studied by varying the geometric parameters using the finite element method. The sensitivity of the proposed design is improved by regularly positioning the array of nanodots in the cavity where the concentration of E-field is high, as a result, the surface plasmon polaritons (SPPs) are intensified at the boundaries of the dots which enhances the interaction between SPPs and the ambient medium. The device sensitivity can be improved by increasing the size of the nanodots. The maximum sensitivity offered by standard square ring resonator is 1520 nm RIU −1 while the maximum sensitivi...

中文翻译：

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纳米点修饰了基于Fano共振的非对称金属-绝缘体-金属波导谐振器结构，用于折射率传感应用

光学传感器广泛用于生物，化学和食品加工行业中的折射率测量。引入了一种新颖的金属-绝缘体-金属方环谐振器配置，其中，在方环的两个相对侧上对角放置一个纳米缝，并用一组银纳米点装饰空腔。通过使用有限元方法改变几何参数，可以彻底研究谐振器的光谱特性。通过将纳米点阵列规则地放置在电场强度较高的腔中，可以提高拟议设计的灵敏度，结果，在点的边界处增强了表面等离振子极化子（SPPs），从而增强了电极的极化强度。 SPP与环境介质之间的相互作用。可以通过增加纳米点的尺寸来改善器件灵敏度。标准方环谐振器提供的最大灵敏度为1520 nm RIU -1，而最大灵敏度为...