Active Plasmonic Nanoantennas for Controlling Fluorescence Beams

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• 作者：Haibo Li ; Shuping Xu ; Yuejiao Gu ; Hailong Wang ; Renping Ma ; John R. Lombardi ; Weiqing Xu
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：September 19, 2013
• 年：2013
• 卷：117
• 期：37
• 页码：19154-19159
• 全文大小：380K
• 年卷期：v.117,no.37(September 19, 2013)
• ISSN：1932-7455

文摘

We propose a tunable plasmonic nanoantenna design that achieves steering fluorescence beams via a voltage signal. The configuration is composed of a nanometallic grating structure coated with a thin luminescent layer and a liquid crystals (LC) cell fixed above as a modulator. The angle-scanned fluorescence spectra show that fluorescence emitted from this metallic grating antenna has a high directivity (divergence angle 鈮?3掳) and the beams present a high monochromaticity (full width at half-maximum 鈮?14 nm). More importantly, the fluorescence wavelength can be continuously tuned at a high repetition rate according to the electric signal applied on the LC modulation layer. We further extended the tunable antenna design to a bullseye-shaped nanoantenna to achieve tunable complete-collimated beams. The active control strategy of luminescence based on plasmonic nanoantennas has a great practical significance in developing novel tunable nanoscale light sources.