Coloring fluorescence emission with silver nanowires

Timur Shegai; Yingzhou Huang; Hongxing Xu; Käll, Mikael
March 2010
Applied Physics Letters;3/8/2010, Vol. 96 Issue 10, p103114
Academic Journal
We demonstrate that emission from Rhodamine-6G fluorophores adsorbed on silver nanowires experiences a spectral redshift upon propagation to the distal ends of the nanowire, with the shift being proportional to the propagation distance. The end of a nanowire thus constitutes a tunable fluorescence source controlled by a single easily adjustable parameter, i.e., the position of the excitation focal spot. The effect is made possible by a combination of radiatively undamped plasmon propagation and dispersive ohmic losses in the silver nanowire. The results may be important for the development of plasmonic waveguides, fast fluorescent color switches and various nanoscale fluorescence sensors.


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