A Plasmonic Fano Switch
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- 作者：Wei-Shun Chang ; J. Britt Lassiter ; Pattanawit Swanglap ; Heidar Sobhani ; Saumyakanti Khatua ; Peter Nordlander ; Naomi J. Halas ; Stephan Link
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：September 12, 2012
- 年：2012
- 卷：12
- 期：9
- 页码：4977-4982
- 全文大小：286K
- 年卷期：v.12,no.9(September 12, 2012)
- ISSN：1530-6992
文摘
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.