A Tamm-Fano resonance glucose sensor based on Cu and distributed bragg reflector plasmonic coupling interface in the near-infrared regime

Abstract

A sensor for the detection of glucose concentration in aqueous medium based on Tamm-Fano resonance is proposed in this research article. The presented sensor configuration mainly comprises of a thin layer of copper on top of a Distributed Bragg Reflector. Alternating layers of Gallium Arsenide with a high refractive index and Silicon dioxide with a low refractive index form the Distributed bragg reflector, respectively. For the detection of analyte such as glucose, a liquid cell has been introduced in between the Cu and Distributed bragg reflector structure. We used Ansys Lumerical software to analyse the sensor's near-infrared reflection spectrum (1000–2400 nm). The proposed sensor structure achieved a Sensitivity, Quality factor, Figure of Merit and Detection Limit of 831.32 nm/RIU, 152.52, 88.91 RIU⁻¹ and 10^–3 RIU, respectively. The proposed sensor structure shows promising results compared to the designs reported in the literature. The present study will be extremely useful for active and passive optoelectronic miniature devices in the future, making the proposed structure valuable not only for glucose detection but also for detecting a wide range of biomolecules and for gas sensing.