Journal
NANO LETTERS
Volume 10, Issue 5, Pages 1722-1727Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl100099g
Keywords
SERS; nanogap; roughness
Categories
Funding
- NSF-NSEC
- NSF-MRSEC
- Keck Foundation, the State of Illinois
- Northwestern University
- NSSEF
- National Science Foundation (NSF)
- NSF-DWR
- MRSEC
- AFOSR/DARPA
- Non-Equilibrium Energy Research Center (NERC)
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0000989]
- Schlumberger Foundation
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Gapped rods provide a unique platform for elucidating structure/function relationships, both for single-molecule electrochemical techniques and for surface-enhanced Raman scattering (SERS). This paper attempts to elucidate the dependence of SERS intensities on gap topography and gap distance for gold gapped rods with segment lengths varying over a wide range (40-2000 nm). Significantly, we have determined that rough gaps lead to a smaller SERS enhancement than smooth gaps for these structures even though the rough gaps have a larger total surface area. Both theory and experiment show periodic variation of SERS intensity with segment length as determined by odd-symmetry plasmon multipoles. Excitation of even-symmetry modes is dipole forbidden (for polarization along the rod axis), but this selection rule can be relaxed by roughness or, for smooth gaps, by near-field coupling between the rod segments.
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