Premium
Surface Plasmon Resonance of A Bimetallic Nanostructured Film for Enhanced Optical Sensitivity
Author(s) -
Mabe Taylor,
Zeng Zheng,
Bagra Bhawna,
Ryan James,
Wei Jianjun
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201800576
Subject(s) - bimetallic strip , surface plasmon resonance , materials science , finite difference time domain method , plasmon , surface plasmon , refractive index , sensitivity (control systems) , nanotechnology , resonance (particle physics) , optoelectronics , optics , metal , nanoparticle , electronic engineering , physics , engineering , particle physics , metallurgy
Abstract A bimetallic (Ag/Au) nanoslit film is reported on surface plasmon (SP) generation and refractive index (RI) sensitivity. These were compared to gold devices in transmission surface plasmon resonance (tSPR). The bimetallic films have a primary resonant peak that shifts with periodicity and correlates well with Finite‐Difference Time‐Domain (FDTD) simulation studies. The SPR of bimetallic nanoslit structures is analyzed via a semi‐analytical model. The model enables decomposition and quantitative analysis of SP generation at the aperture under plane‐wave illumination. The nanostructured, metallic, thin films provide flexibility to integrate with microfluidics, allowing for simplified instrumentation and alignment. Calculation and experimentation demonstrate that bimetallic films afford an increase in RI sensitivity due to the addition of silver along with the biocompatibility of gold. The Ag/Au films were found to be non‐diffusing, long‐term stable (over several months), and provided an increase in sensitivity (about 53/RIU) over gold equivalents.