A Plasmonic Fano Switch

作者：Chang Wei Shun; Lassiter J Britt; Swanglap Pattanawit; Sobhani Heidar; Khatua Saumyakanti; Nordlander Peter; Halas Naomi J^*; Link Stephan

来源：Nano Letters, 2012, 12(9): 4977-4982.

DOI：10.1021/nl302610v

• Surface plasmon resonance
• Farm resonance
• active plasmonics
• liquid crystals
• single particle spectroscopy

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 (similar to 6 V) applied voltages, resulting in a complete on/off switching of the transparency

• 出版日期2012-9