A high-sensitivity biosensor based on a metal–insulator–metal diamond resonator and application for biochemical and environment detections

• Published in: Optik (Stuttgart) Vol. 271; p. 170083
• Main Authors: Bahri, Hocine, Hocini, Abdesselam, Bensalah, Hocine, Mouetsi, Souheil, Ingebrandt, Sven, Pachauri, Vivek, Hamani, Malika
• Format: Journal Article
• Language: English
• Published: Elsevier GmbH 01.12.2022
• Subjects: Biosensor; Finite-Difference-Time-Domain (FDTD); Metal-insulator-metal (MIM); Near-infrared (NIR) and mid-infrared (MIR); Refractive Index (RI); Metal-insulator-metal (MIM); Near-infrared (NIR) and mid-infrared (MIR); Biosensor; Finite-Difference-Time-Domain (FDTD); Refractive Index (RI)
• ISSN: 0030-4026; 1618-1336
• DOI: 10.1016/j.ijleo.2022.170083

In this paper, a novel Refractive Index (RI) sensor on tunable plasmonic nanostructures in the near-infrared (NIR) and mid-infrared (MIR) range has been investigated, using metal-insulator-metal (MIM) and a couple of hexagonal, trapezoid, and diamond cavity (HTD) shapes. The proposed biosensor has a potential biochemical application such as glucose in water and temperature, the numerical results were obtained from the Finite-Difference-Time-Domain (FDTD) method. By optimizing the parameters of the proposed structure, we achieved maximum sensitivity reaching 5155 nm per refractive index unit (RIU), and an extensive range of refractive index from 1 to 1.7 makes the sensor suitable for biochemical as well as medical diagnostic applications, with wavelength resolution reaching as high as 3.5 × 106 RIU−1. Due to its high sensitivity, this structure could pave the way for the development of a feature plasmonic biosensor, sharp spectral response, small size, and wide detection range. •A Refractive Index (RI) sensor on tunable plasmonic nanostructures in the near-infrared (NIR) and mid-infrared (MIR) range has been investigated, using metal-insulator-metal (MIM) and a couple of hexagonal, trapezoid, and diamond cavity (HTD) shapes.•Theproposed biosensor has the potential for application for biochemical andenvironment detections.•Thenumerical results were obtained from the Finite-Difference-Time-Domain (FDTD)method.•Weachieved maximum sensitivity reaching 5155 nm per refractive index unit (RIU),and an extensive range of refractive indices from 1 to 1.7 makes the sensorsuitable for biochemical as well as medical diagnostic applications, withwavelength resolution reaching as high as 3.5 × 106 RIU−1.•Dueto its high sensitivity, this structure could pave the way for the developmentof a feature plasmonic biosensor, sharp spectral response, small size, and widedetection range.