Anisotropic surface plasmon excitation in Au/silica nanowire

Chien-Ting Wu; Ming-Wen Chu; Sheng-Bo Wang; Ming-Shien Hu; Kuei-Hsien Chen; Li-Chyong Chen; Chun-Wei Chen; Cheng-Hsuan Chen
June 2010
Applied Physics Letters;6/28/2010, Vol. 96 Issue 26, p263106
Academic Journal
The surface plasmon (SP) excitations of gold/silica nanowire, investigated by electron energy-loss spectroscopy in conjunction with scanning transmission electron microscopy, are found to be anisotropic with stronger SP intensities observed along the transverse direction of the nanowire. This indicates that the charge carriers generated near the surface of the nanowires by the decay of SP resonance play a significant role to the enhanced photoconductivity. This conclusion is reaffirmed by the polarization dependent photoconductivity measurement.


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