Metal‐Insulator‐Metal Waveguide Plasmonic Sensor System for Refractive Index Sensing Applications

Abstract

Plasmonic sensors are well known for their miniaturized size and high sensitivity. Herein, a numerical analysis of a metal‐insulator‐metal (MIM) waveguide (WG) for refractive index (RI) sensing applications is proposed. The sensing device is composed of a MIM bus WG with a semicircular formation side coupled to a semicircular cavity. This configuration provides a transmission dip with a high extinction ratio as compared to the standard MIM WG side‐coupled to a semicircular cavity. Moreover, the mode converters are also embedded in the sensing system solving the obstacle of light coupling to the MIM plasmonic WG. The sensitivity of the proposed device is ≈941.33 nm RIU−1, making it a promising candidate to be employed in point‐of‐care (POC) testing. This typically involves the use of portable or handheld diagnostic devices that can quickly analyze samples of blood, urine, or other bodily fluids to diagnose diseases or conditions such as infections, diabetes, or heart disease.

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“…Au is chosen as a metal due to its biocompatibility, superior chemical stability [29], oxidation resistance and non-toxic properties [30][31][32]. Au does not react with the biological molecules, and is chemically stable.…”

Nano Application of Oil Concentration Detection Using Double-Tooth Ring Plasma Sensing

“…In recent years, metal-insulator-metal (MIM) waveguide structures have demonstrated the capability to confine and guide surface plasmon polaritons (SPPs), enabling the effective localization of light fields between the metal surface and the insulator [6,7]. This facilitates the enhancement of electromagnetic fields on the metal surface, thereby promoting the generation of SPPs.…”

A single-mode tunable plasmonic sensor based on an 8-shaped resonator for cancer cell detection

“…Due to their small size, simplicity of integration, and good balance between light localization and transmission loss, plasmonic sensors are a good candidate to produce highly integrated optical circuits. Plasmonic sensors offer several unique advantages such as label-free detection, high sensitivity, rapid response, real-time monitoring, strong amplification of a local electric field, spectral tunability and compliance with nanotechnology 56 . Despite these advantages, they have some limitations such as limited penetration depth, limited selectivity and limited reproducibility.…”

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“…The proposed plasmonic structure can be fabricated using electron beam lithography (EBL) with adequate exposure time and focused ion beam (FIB) technique 58 . Generally, the fabrication of plasmonic structures can be costly and time-consuming, which can limit their use in some specific applications 56 .…”