A tunable ultrasensitive plasmonic biosensor based on α-MoO3/graphene hybrid architecture. (22nd March 2021)

• Record Type: Journal Article
• Authors: Wei, Chenwei; Cao, Tun
• Is Part Of: Journal of physics. Volume 54:Number 23(2021)
• Publication Date: 2021-03-22
• Subjects: biosensor -- hybrid architecture -- tunable; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/abe78e
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: Two-dimensional (2D) materials attract wide attention due to their unique exciting physical properties, which offer new opportunities to design novel devices with enhanced or multiple functionalities. In particular, α -phase molybdenum trioxide ( α -MoO3 ) is an emerging 2D material and exhibits strong anisotropic optical properties and low optical losses in the visible region, making it a promising candidate in tunable optical devices. Here, we proposed a tunable plasmonic biosensor based on α -MoO3 /graphene hybrid architectures. By optimizing Au film thickness, the number of α -MoO3 layers and rotation angle, our proposed biosensor can achieve a high phase detection sensitivity of 1.5172 × 10 5 deg RIU −1 with a biosensor configuration of SF11 prism/47 nm Au/6-layer α -MoO3 /monolayer graphene at the rotation angle ϕ = 60°. In addition, the proposed biosensor represents tunable phase detection sensitivity since α -MoO3 can act as a polarizer. Our approach offers a new direction in the development of tunable ultrasensitive plasmonic biosensors for label-free detection and ultralow-concentration analytes.