Electrodynamic effects in plasmonic nanolenses
- 12 March 2008
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 77 (11), 115419
- https://doi.org/10.1103/physrevb.77.115419
Abstract
Full electrodynamic analysis of self-similar cascades of plasmonic nanospheres (nanolenses) that exhibit nanofocusing is performed. Electrodynamic resonances are identified and a significant local field enhancement (by a factor of hundreds) is found for different sizes and fractal ratios of the cascade system, and for different polarizations and directions of incidence of the excitation radiation. Supporting the earlier findings, the nanofocus (“hottest spot”) is found to be located in the gap between the two smallest nanospheres of the cascade. Somewhat surprisingly, field enhancement is maximized when the incoming wave is polarized at an angle to the symmetry axis. The influence of the dielectric substrate on field enhancement is also evaluated. The results obtained show ways to optimize the nanolenses for their applications in spectroscopy and sensing.Keywords
This publication has 32 references indexed in Scilit:
- Two-photon vibrational spectroscopy for biosciences based on surface-enhanced hyper-Raman scatteringProceedings of the National Academy of Sciences, 2006
- Li, Stockman, and Bergman Reply:Physical Review Letters, 2006
- Comment on “Self-Similar Chain of Metal Nanospheres as an Efficient Nanolens”Physical Review Letters, 2006
- Scattering Spectra of Single Gold NanoshellsNano Letters, 2004
- Continuum generation from single gold nanostructures through near-field mediated intraband transitionsPhysical Review B, 2003
- Single Molecule Raman Spectroscopy at the Junctions of Large Ag NanocrystalsThe Journal of Physical Chemistry B, 2003
- Squeezing the Optical Near-Field Zone by Plasmon Coupling of Metallic NanoparticlesPhysical Review Letters, 1999
- Probing Single Molecules and Single Nanoparticles by Surface-Enhanced Raman ScatteringScience, 1997
- Surface-enhanced spectroscopyReviews of Modern Physics, 1985
- Optical Constants of the Noble MetalsPhysical Review B, 1972