Selective Excitation of Individual Plasmonic Hotspots at the Tips of Single Gold Nanostars
Selective Excitation of Individual Plasmonic Hotspots at the Tips of Single Gold Nanostars
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DOI：
10.1021/nl103007m
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发表时间：
2011-02-01
期刊：
影响因子：
10.8
通讯作者：
Charra, Fabrice
中科院分区：
文献类型：
--
作者：
Hrelescu, Calin;Sau, Tapan K.;Charra, Fabrice
单金纳米星中的等离子热点位于尖端，并且可以通过激光选择性地激发，如通过光电子发射显微镜所证明的。通过激发光的波长和偏振实现选择性。比较光电子发射强度和暗场散射光谱相同的个人nanostars揭示了可观察到的等离子体共振波长和字段增强方面的差异。差异解释与两种技术的基本近场和远场过程。
Plasmonic hotspots in single gold nanostars are located at the tips and can be excited selectively by laser light as evidenced by photo-electron emission microscopy. Selectivity is achieved through wavelength and polarization of the excitation light. Comparing photoelectron emission intensity and dark field scattering spectra of the same individual nanostars reveals differences in terms of observable plasmon resonance wavelengths and field enhancements. Differences are explained with the underlying near-and far-field processes of the two techniques.