Work

Local Refractive Index Sensitivity of Localized Surface Plasmon Resonance Biosensors

Year: 2024

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide The sensitivity of localized surface plasmon resonance (LSPR) biosensors to a change in the local refractive index (RI) is investigated theoretically. By combining an effective medium theory and a quasistatic theory, analytical expressions for the local RI sensitivity are derived. Electromagnetic simulations show that the expressions can predict the sensitivity well for LSPR biosensors of various sizes and geometries including nanocylinders, nanodisks, nanorods and nanotriangles for both two- and three-layer systems. Like the bulk RI sensitivity, the local RI sensitivity is shown to depend linearly on the resonant wavelength of the biosensors. Other than two parameters used to linearize the dielectric function of the metal core, there are no fitting parameters. Hence, the expressions can be used to predict the local RI sensitivity of LSPR biosensors directly from the resonant wavelength.

Source: The Journal of Physical Chemistry C

DOI: 10.1021/acs.jpcc.4c03456

Authors: Allison Rabbani, Rachel Rudacille, Keisuke Hasegawa

Institution: Grinnell College

Language: English

Topic: Plasmonic and Surface Plasmon Research

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,500

Funder: Grinnell College