A Plasmonic Fano Switch
Nano Letters2012Vol. 12(9), pp. 4977–4982
Citations Over TimeTop 1% of 2012 papers
Wei‐Shun Chang, J. Britt Lassiter, Pattanawit Swanglap, Heidar Sobhani, Saumyakanti Khatua, Peter Nordlander, Naomi J. Halas, Stephan Link
Abstract
Plasmonic clusters can support Fano resonances, where the line shape characteristics are controlled by cluster geometry. Here we show that clusters with a hemicircular central disk surrounded by a circular ring of closely spaced, coupled nanodisks yield Fano-like and non-Fano-like spectra for orthogonal incident polarization orientations. When this structure is incorporated into an uniquely broadband, liquid crystal device geometry, the entire Fano resonance spectrum can be switched on and off in a voltage-dependent manner. A reversible transition between the Fano-like and non-Fano-like spectra is induced by relatively low (∼6 V) applied voltages, resulting in a complete on/off switching of the transparency window.
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