Near-field, broadband optical spectroscopy of metamaterials
نویسندگان
چکیده
Near-field, broadband optical spectroscopy of metamaterials is reported. A compact, easy to assemble supercontinuum light source, coupled with a near-field scanning optical microscope and spectrometer provide the means to locally probe the spectral response of a nanorod metamaterial sample. Spectral maps of near-field transmittance are obtained for the spectral range from 500 to 950 nm. In comparison to far-field measurement, the average of the near-field mappings shows a significant increase in transmittance. The uniqueness of the spectral maps and the increased transmittance indicates a strong nanoantenna effect between the sample and the plasmonic near-field aperture. r 2007 Elsevier B.V. All rights reserved. PACS: 78.67. n; 87.64.Xx; 4255.Tv; 81.07. b
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