Launching Propagating Surface Plasmon Polaritons by a Single Carbon Nanotube Dipolar Emitter

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• 作者：Nicolai Hartmann ; Giovanni Piredda ; Johann Berthelot ; G茅rard Colas des Francs ; Alexandre Bouhelier ; Achim Hartschuh
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：January 11, 2012
• 年：2012
• 卷：12
• 期：1
• 页码：177-181
• 全文大小：303K
• 年卷期：v.12,no.1(January 11, 2012)
• ISSN：1530-6992

文摘

We report on the excitation of propagating surface plasmon polaritons in thin metal films by a single emitter. Upon excitation in the visible regime, individual semiconducting single-walled carbon nanotubes are shown to act as directional near-infrared point dipole sources launching propagating surface plasmons mainly along the direction of the nanotube axis. Plasmon excitation and propagation is monitored in Fourier and real space by leakage radiation microscopy and is modeled by rigorous theoretical calculations. Coupling to plasmons almost completely reshapes the emission of nanotubes both spatially and with respect to polarization as compared to photoluminescence on a dielectric substrate.

Keywords:

Surface plasmons; single-walled carbon nanotubes; photoluminescence; radiation pattern imaging; leakage radiation microscopy