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Longitudinal and transverse coupling in infrared gold nanoantenna arrays: long range versus short range interaction regimes

AuthorsWeber, Daniel; Albella, Pablo CSIC ORCID; Alonso-González, Pablo CSIC ORCID ; Neubrech, Frank; Gui, Han; Nagao, Tadaaki; Hillenbrand, Rainer; Aizpurua, Javier CSIC ORCID ; Pucci, Annemarie
Issue Date2011
PublisherOptical Society of America
CitationOptics Express 19(16): 15047-15061 (2011)
AbstractInteraction 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 dx and dy 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 dy, 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 dx does only marginally broaden the resonance. Our findings set a path for optimum design of rectangular nanorod lattices for surface enhanced infrared spectroscopy.
Description15 páginas, 8 figuras.
Publisher version (URL)http://dx.doi.org/10.1364/OE.19.015047
Appears in Collections:(CFM) Artículos
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