Sensitivity Enhanced Plasmonic Biosensor Using Bi₂Se₃-Graphene Heterostructures: A Theoretical Analysis.

ABSTRACT: This study provided a theoretical insight for designing novel plasmonic biosensors using bismuth selenide (Bi₂Se₃)-Graphene heterostructures. It was a van der Waals (vdWs) stacked configuration composed of gold (Au) film, few quintuple layer (QL) Bi₂Se₃ and few-layered graphene. In particular, the proposed biosensor was created by Goos-Hänchen (GH) shift rather than phase, resulting in a more sensitive biosensing response. Under the excitation of 632.8 nm, significant sensitivity enhancement performance was obtained via varying the thickness of Bi₂Se₃-Graphene heterostructures. The best configuration was 32 nm Au film-2-QL Bi₂Se₃-3-layer graphene, generating the largest GH shift, as high as -1.0202 × 10

SUBMITTER: Du F 

PROVIDER: S-EPMC9696186 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature