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Nano Lett. 2007 May;7(5):1113-8. Epub 2007 Apr 14.

Highly tunable infrared extinction properties of gold nanocrescents.

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  • 1Department of Chemistry, University of Utah, Salt Lake City, Utah 84112-0850, USA.


The infrared extinction properties of gold nanocrescents fabricated using nanosphere template lithography were studied. The nanocrescents exhibit multiple, structurally tunable localized surface plasmon resonances (LSPRs) across a broad spectral range (560-3600 nm). Plasmon resonances in the infrared have large extinction efficiencies of approximately 20 and peaks as narrow as 0.07 eV. The nanocrescents also have high refractive index sensitivities (370-880 nm/RIU) that are proportional to the LSPR wavelengths. The sensing figure of merit measured for ensembles of nanocrescents is as high as 2.4 for near-infrared plasmon resonances.

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