6533b871fe1ef96bd12d1178
RESEARCH PRODUCT
Imaging Symmetry-Selected Corner Plasmon Modes in Penta-Twinned Crystalline Ag Nanowires
Alexandre BouhelierDouguo ZhangJadab SharmaErik DujardinPierre BramantGérard Colas-des-francsMingxia Songsubject
Materials scienceNanowireGeneral Physics and AstronomyPhysics::Optics02 engineering and technologySubstrate (electronics)01 natural sciencesMolecular physicsCondensed Matter::Materials ScienceOptics0103 physical sciencesMicroscopyGeneral Materials ScienceWave vectorMolecular orbital[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics010306 general physicsPlasmonbusiness.industrySurface plasmonGeneral Engineering021001 nanoscience & nanotechnology[ SPI.NANO ] Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics0210 nano-technologybusinessLocalized surface plasmondescription
International audience; Using dual-plane leakage radiation microscopy, we investigate plasmon propagation in individual penta-twinned crystalline silver nanowires. By measuring the wavevector content of the light emitted in the substrate, we unambiguously determine the effective index and the losses of the mode propagating in these structures. The experimental results, in particular, the unexpectedly low effective index, reveal the direct influence of the nanowire crystallinity and pentagonal structure on the observed plasmon modes. By analogy with molecular orbitals of similar symmetry, the plasmon modes are also determined numerically in good agreement with the observed values. We further investigate the effect of wire geometry (length, diameter) on the effective index and propagation loss. Our results show that, beyond dissipation concerns, the morphological and structural control obtained in crystalline colloidal plasmonic nanostructures can be exploited to finely tune their optical properties.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-06-18 |