ArticleRSC advances2025
Oxidation-free nanoscale optomechanical sensor incorporating a triangular truss resonator for crosstalk-free bimodal pressure and temperature sensing.
Article in RSC advances, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Recently, we have witnessed significant advancements made by researchers in using silver-based Metal-Insulator-Metal (MIM) plasmonic devices for their improved performance. However, the practical applicability of these sensors is still under scrutiny. Very few studies have been conducted looking for alternative approaches to improve the viability of deploying these sensors for use in challenging operational conditions. This paper articulates a novel MIM-based dual-function optomechanical sensor utilizing oxidation-free gold as the plasmonic material, capable of sensing pressure and temperature in parallel. To the best of the authors' knowledge, this marks the first instance of investigating an optical MIM pressure sensor using oxidation-resistant gold as the plasmonic material. The proposed sensor consists of a Triangular Truss Resonator (TTR) and a pair of Rectangular Cavities (RCs) coupled to a straight waveguide. The TTR is utilized for sensing pressure, while the RCs are responsible for detecting temperature variations. Employing the Finite Element Method (FEM), we numerically investigated the device's transmission spectrum, which comprised two independent resonant wavelengths, namely mode 1 and mode 2, enabling dual-function sensing capabilities with distinct and independent responses. The sensor demonstrates a notable pressure sensitivity of 77.1 nm MPa
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