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Boosting the Figure Of Merit of LSPR-based refractive index sensing by phase-sensitive measurements
- Publication Year :
- 2012
-
Abstract
- Localized surface plasmon resonances possess very interesting properties for a wide variety of sensing applications. In many of the existing applications, only the intensity of the reflected or transmitted signals is taken into account, while the phase information is ignored. At the center frequency of a (localized) surface plasmon resonance, the electron cloud makes the transition between in- and out-of-phase oscillation with respect to the incident wave. Here we show that this information can experimentally be extracted by performing phase-sensitive measurements, which result in linewidths that are almost 1 order of magnitude smaller than those for intensity based measurements. As this phase change is an intrinsic property of a plasmon resonance, this opens up many possibilities for boosting the figure-of-merit (FOM) of refractive index sensing by taking into account the phase of the plasmon resonance. We experimentally investigated this for two model systems: randomly distributed gold nanodisks and gold nanorings on top of a continuous gold layer and a dielectric spacer and observed FOM values up to 8.3 and 16.5 for the respective nanoparticles. ispartof: Nano Letters vol:12 issue:3 pages:1655-1659 ispartof: location:United States status: published
- Subjects :
- Phase transition
Materials science
FOS: Physical sciences
Physics::Optics
Bioengineering
Dielectric
spectroscopic ellipsometty
Phase Transition
plasmonics
Materials Testing
Figure of merit
General Materials Science
LSPR sensing
Center frequency
Surface plasmon resonance
refractive index sensing
business.industry
Mechanical Engineering
General Chemistry
phase difference
Condensed Matter Physics
retardation
Refractometry
Optoelectronics
Nanoparticles
Gold
business
Refractive index
Order of magnitude
Algorithms
Localized surface plasmon
Optics (physics.optics)
Physics - Optics
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....eddd3e39c6452dcca81a73b50120c593