Plasmonic Metal-Insulator-Metal (MIM) Refractive Index Sensor for Glucose Level Monitoring.

In this article, we introduce a novel H-shaped plasmonic refractive index (RI) sensor coupled with a bus waveguide. The sensor is designed to interact with a straight metal-insulator-metal (MIM) waveguide configuration. To analyze the proposed structure, the finite element method (FEM) is employed, allowing for a comprehensive numerical investigation. The primary function of this sensor is to detect changes in RI by monitoring alterations in the resonant wavelength. The sensing mechanism involves the interaction of light with the plasmonic structure, and any variations in the RI of the surrounding medium induce changes in the resonant wavelength of the sensor. This phenomenon is crucial for applications such as biosensing and chemical analysis. To optimize the sensor's performance, the authors conducted a thorough process of geometric parameter optimization. Consequently, the recorded maximum sensitivity of the sensor, reported as 1960 nm/RIU for mode 2 and 1420 nm/RIU for mode 1, underscores its exceptional capability to discern minute quantities of molecules, showcasing a heightened sensitivity that sets it apart in molecular detection applications. Furthermore, we extend the applicability of their proposed sensor by numerically analyzing its performance in measuring the glucose content of blood. This highlights the versatility of the sensor, showcasing its potential for biomedical applications. [ABSTRACT FROM AUTHOR]