Title
Universal scaling of the figure of merit of plasmonic sensors
Author
Offermans, P.
Schaafsma, M.C.
Rodriguez, S.R.K.
Zhang, Y.
Crego-Calama, M.
Brongersma, S.H.
Gómez Rivas, J.
Publication year
2011
Abstract
We demonstrate an improvement by more than 1 order of magnitude of the figure of merit (FoM) of plasmonic nanoparticle sensors by means of the diffractive coupling of localized surface plasmon resonances. The coupling in arrays of nanoparticles leads to Fano resonances with narrow line widths known as surface lattice resonances, which are very suitable for the sensitive detection of small changes in the refractive index of the surroundings. We focus on the sensitivity to the bulk refractive index and find that the sensor FoM scales solely with the frequency difference between the surface lattice resonance and the diffracted order grazing to the surface of the array. This result, which can be extended to other systems with coupled resonances, enables the design of plasmonic sensors with a high FoM over broad spectral ranges with unprecedented accuracy. © 2011 American Chemical Society.
Subject
Mechatronics, Mechanics & Materials
HOL - Holst
TS - Technical Sciences
Industrial Innovation
figure-of-merit
nanoparticle
plasmon
resonance
scaling
sensing
Broad spectral
Coupled resonance
Diffractive coupling
Fano resonances
figure-of-merit
Frequency differences
Localized surface plasmon resonance
Narrow-line width
Plasmonic nanoparticle
Plasmonic sensors
scaling
sensing
Sensitive detection
Surface lattice
Universal scaling
Light refraction
Nanoparticles
Refractive index
Refractometers
Sensors
Surface plasmon resonance
Plasmons
To reference this document use:
http://resolver.tudelft.nl/uuid:1436855b-a411-4c98-8cb9-3223a6a38468
DOI
https://doi.org/10.1021/nn201227b
TNO identifier
461447
ISSN
1936-0851
Source
ACS Nano, 5 (6), 5151-5157
Document type
article