Journal
NANO LETTERS
Volume 12, Issue 6, Pages 2817-2821Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl300160y
Keywords
Dark field; nanoplasmonics; spectroscopy; polarization; Fano resonance; nanoshell
Categories
Funding
- Robert A. Welch foundation [C-1222, C-1220, E-1728]
- National Science Foundation [ECCS-1040478]
- US Department of Defense NSEFF [N00244-09-1-0067]
- Defense Threat Reduction Agency (DTRA) [HDTRA1-11-1-0040]
- Office of Naval Research [N00244-09-1-0989]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1040478] Funding Source: National Science Foundation
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The spectroscopic characterization of individual nanostructures is of fundamental importance to understanding a broad range of physical and chemical processes. One general and powerful technique that addresses this aim is dark-field microscopy, with which the scattered light from an individual structure can be analyzed with minimal background noise. We present the spectroscopic analysis of individual plasmonic nanostructures using dark-field illumination with incidence nearly normal to the substrate. We show that, compared to large incidence angle approaches, the near-normal incidence approach provides significantly higher signal-to-background ratios and reduced retardation field effects. To demonstrate the utility of this technique, we characterize an individual chemically synthesized gold nanoshell and a lithographically defined heptamer exhibiting a pronounced Fano-like resonance. We show that the line shape of the latter strongly depends on the incidence angle. Near-normal incidence dark-field microscopy can be used to characterize a broad range of molecules and nanostructures and can be adapted to most microscopy setups.
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