Journal
OPTICS EXPRESS
Volume 19, Issue 16, Pages 15047-15061Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.015047
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Funding
- European project NANOANTENNA [HEALTH-F5-2009-241818]
- Japan Science and Technology Agency
- Heidelberg Graduate School of Fundamental Physics
- Spanish Ministry of Science and Innovation [FIS-2010-19609-C02-02]
- Department of Industry of the Basque Government
- German Science Foundation [DFG PU193/9-1]
- Grants-in-Aid for Scientific Research [20671002] Funding Source: KAKEN
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Interaction between micrometer-long nanoantennas within an array considerably modifies the plasmonic resonant behaviour; for fundamental resonances in the infrared already at micrometer distances. In order to get systematic knowledge on the relationship between infrared plasmonic resonances and separation distances d(x) and d(y) in longitudinal and transverse direction, respectively, we experimentally studied the optical extinction spectra for rectangularly ordered lithographic gold nanorod arrays on silicon wafers. For small d(y), strong broadening of resonances and strongly decreased values of far-field extinction are detected which come along with a decreased near-field intensity, as indicated by near-field amplitude maps of the interacting nanoantennas. In contrast, near-field interaction over small d(x) does only marginally broaden the resonance. Our findings set a path for optimum design of rectangular nanorod lattices for surface enhanced infrared spectroscopy. (C) 2011 Optical Society of America
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