6533b86efe1ef96bd12ccaa7
RESEARCH PRODUCT
Plasmonic Silver Nanorod Sensitivity: Experiment and Simple Theoretical Treatment
Arpad JakabJan BeckerUlrich HohenesterYuriy KhalavkaAndreas TrüglerCarsten SönnichsenChristina Rosmansubject
Materials sciencebusiness.industrySurface plasmonPhysics::OpticsResonanceengineering.materialMolecular physicsOpticsPolarizabilityPhysics::Atomic and Molecular ClustersengineeringNoble metalNanorodSurface plasmon resonancebusinessRefractive indexPlasmondescription
We compare the plasmonic sensitivity of silver and gold nanorods with similar resonance wavelengths by monitoring the plasmon resonance shift of single noble metal nanorods upon changing the environment from water to sucrose solution. We find that silver nanorods have 1.2 to 2 times higher sensitivity than gold in good agreement with simulations based on the boundary-elements-method (BEM). To exclude the effect of particle volume on sensitivity, we test gold rods with increasing particle width at a given resonance wavelength. Using the Drude-model of optical properties of metal together with the quasi-static approximation (QSA) for localized surface plas-mons, we show that the dominant contribution to higher sensitivity of silver is the lower background polarizability of the d-band electrons and provide a simple formula for the sensitivity.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-01-01 | CLEO: 2013 |