Abstract
A highly sensitive plasmonic refractive index biosensor for hemoglobin protein detection in blood is presented in the near-infrared region. The proposed Au split-ring resonator structure with an extra arm is used to increase electric field enhancement intensity in the vicinity of the nanostructure, which excites localized surface plasmon resonances in the metal-dielectric interface and leads to unity absorption. The footprint of the proposed structure is ${\lambda ^3}/{{125}}$ ($\lambda$ denoting center wavelength). Through the results from the finite element method (FEM), by variation of the spacer material, and inserting a graphene layer between the spacer and the gold nanostructure, maximum sensitivities of 1804.1 nm/RIU and 2448.45 nm/RIU are achieved, respectively.
© 2021 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Shahriar Mostufa, Alok Kumar Paul, and Kisalaya Chakrabarti
OSA Continuum 4(8) 2164-2176 (2021)
Meisam Esfandiari, Saughar Jarchi, Paria Nasiri-Shehni, and Mohsen Ghaffari-Miab
Appl. Opt. 60(5) 1201-1208 (2021)
Abolfazl Nourizad, Saeed Golmohammadi, Mohammad Reza Tohidkia, and Ayuob Aghanejad
Appl. Opt. 62(25) 6542-6552 (2023)