Fluoride Fiber-Based Plasmonic Biosensor with Two-Dimensional Material Heterostructures: Enhancement of Overall Figure-of-Merit via Optimization of Radiation Damping in Near Infrared Region

Abstract

Two-dimensional (2D) heterostructure materials show captivating properties for application in surface plasmon resonance (SPR) sensors. A fluoride fiber-based SPR sensor is proposed and simulated with the inclusion of a 2D heterostructure as the analyte interacting layer. The monolayers of two 2D heterostructures (BlueP/MoS2 and BlueP/WS2, respectively) are considered in near infrared (NIR). In NIR, an HBL (62HfF4-33BaF2-5LaF3) fluoride glass core and NaF clad are considered. The emphasis is placed on figure of merit (FOM) enhancement via optimization of radiation damping through simultaneous tuning of Ag thickness (dm) and NIR wavelength (λ) at the Ag-2D heterostructure–analyte interfaces. Field distribution analysis is performed in order to understand the interaction of NIR signal with analyte at optimum radiation damping (ORD) condition. While the ORD leads to significantly larger FOM for both, the BlueP/MoS2 (FOM = 19179.69 RIU−1 (RIU: refractive index unit) at dm = 38.2 nm and λ = 813.4 nm)-based sensor shows massively larger FOM compared with the BlueP/WS2 (FOM = 7371.30 RIU−1 at dm = 38.2 nm and λ = 811.2 nm)-based sensor. The overall sensing performance was more methodically evaluated in terms of the low degree of photodamage of the analyte, low signal scattering, high power loss, and large field variation. The BlueP/MoS2-based fiber SPR sensor under ORD conditions opens up new paths for biosensing with highly enhanced overall performance.

2D Material‐Based Optical Biosensor: Status and Prospect

“…For example, a fluorine‐based optical fiber sensor is suitable for the simulation and analysis of liver malignant tumors, and its structure is shown in Figure 15e . [ 141 ]…”

“…Reproduced with permission. [ 141 ] Copyright 2019, MDPI. f) SPR biosensor based on ITO–WS 2 hybrid structure.…”

“…For example, a fluorine-based optical fiber sensor is suitable for the simulation and analysis of liver malignant tumors, and its structure is shown in Figure 15e. [141] Other hybrid structures, such as SPR biosensor based on indium tin oxide (ITO)-WS 2 hybrid structure, have significantly improved performance compared with traditional metal-based SPR sensors, [142] as shown in Figure 15f. This is because ITO is a mixture of In 2 O 3 and SnO 2 , and has the advantages of adjustable dielectric constant, small capacitance, and high transmittance.…”

“…e) Near-infrared SPR sensor based on 2D heterostructure. Reproduced with permission [141]. Copyright 2019, MDPI.…”

On The Application of SiO2/SiC Grating on Ag for High-Performance Fiber Optic Plasmonic Sensing of Cortisol Concentration

“…However, the fiber optic (FO) based SPR sensors have gained popularity due to its lightweight sensing configuration [18,19]. Recently, a lossy mode resonance (LMR) based fiber sensor with the ZnO nanocomposite for salivary cortisol detection was reported by Usha et al [20] with a detection limit of 25.9 fg/mL but fiber SPR sensor for cortisol detection still has a lot of scope of work.…”