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.
Highlights
The advancements in the field of two dimensional (2D) materials have opened up new paths for their application in various optoelectronics devices [1,2]
P-polarized waves, which exist at metal-dielectric interface (MDI), are referred to as surface plasmon polaritons (SPPs), and their resonant oscillation under the influence of an external field is known as surface plasmon resonance (SPR)
The application of a 2D heterostructure as the analyte interacting layer in a fluoride fiber SPR sensor aimed at detecting malignant liver tissue (MET, with reference to normal tissue N) was explored in this work
Summary
The advancements in the field of two dimensional (2D) materials have opened up new paths for their application in various optoelectronics devices [1,2]. Increasing the number of graphene layers causes an increase in the damping within the layers, which affects the sensing precision [13] In this context, the combination of graphene with other 2D materials, forming a heterostructure, has recently been explored for sensitivity enhancement [14,15,16]. Several research works have been reported based on the application of 2D material (graphene and MoS2 )-assisted heterojunction in fiber SPR sensors for figure of merit enhancement by tuning the radiation damping (RD) [22,23]. To the best of our knowledge, this is the first work based on the application of monolayer 2D heterostructures (BlueP/TMDs) in fiber-optic SPR sensors for biosample detection. The sensor’s performance is more comprehensively evaluated in terms of its low photodamage, low signal scattering, high power loss, and large field variation
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