Free-Standing Optical Gold Bowtie Nanoantenna with Variable Gap Size for Enhanced Raman Spectroscopy
- 19 November 2010
- journal article
- research article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 10 (12), 4952-4955
- https://doi.org/10.1021/nl102963g
Abstract
We describe plasmonic interactions in suspended gold bowtie nanoantenna leading to strong electromagnetic field (E) enhancements. Surface-enhanced Raman scattering (SERS) was used to demonstrate the performance of the nanoantenna. In addition to the well-known gap size dependence, up to 2 orders of magnitude additional enhancement is observed with elevated bowties. The overall behavior is described by a SERS enhancement factor exceeding 1011 along with an anomalously weak power law dependence of E on the gap size in a range from 8 to 50 nm that is attributed to a plasmonic nanocavity effect occurring when the plasmonic interactions enter a strongly coupled regime.Keywords
This publication has 32 references indexed in Scilit:
- A perspective on single molecule SERS: current status and future challengesPhysical Chemistry Chemical Physics, 2008
- Probing the Structure of Single-Molecule Surface-Enhanced Raman Scattering Hot SpotsJournal of the American Chemical Society, 2008
- A Frequency Domain Existence Proof of Single-Molecule Surface-Enhanced Raman SpectroscopyJournal of the American Chemical Society, 2007
- Designing, fabricating, and imaging Raman hot spotsProceedings of the National Academy of Sciences, 2006
- Exploring the chemical enhancement for surface-enhanced Raman scattering with Au bowtie nanoantennasThe Journal of Chemical Physics, 2006
- Nanosphere Arrays with Controlled Sub-10-nm Gaps as Surface-Enhanced Raman Spectroscopy SubstratesJournal of the American Chemical Society, 2005
- Gap-Dependent Optical Coupling of Single “Bowtie” Nanoantennas Resonant in the VisibleNano Letters, 2004
- Plasmon-Sampled Surface-Enhanced Raman Excitation SpectroscopyThe Journal of Physical Chemistry B, 2003
- Ag Nanocrystal Junctions as the Site for Surface-Enhanced Raman Scattering of Single Rhodamine 6G MoleculesThe Journal of Physical Chemistry B, 2000
- Spectroscopy of Single Hemoglobin Molecules by Surface Enhanced Raman ScatteringPhysical Review Letters, 1999