Selective excitation of individual plasmonic hotspots at the tips of single gold nanostars.
Plasmonic hotspots in single gold nanostars are located at the tips and can be excited selectively by laser light as evidenced by photoelectron 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.
Department of Physics and CeNS, Ludwig-Maximilians-Universität München, München, Germany.
Calin
C
Hrelescu
Tapan K
TK
Sau
Andrey L
AL
Rogach
Frank
F
Jäckel
Guillaume
G
Laurent
Ludovic
L
Douillard
Fabrice
F
Charra
D006046:Gold / Q000737:chemistry*; D007834:Lasers; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000379:methods*
D006046:Gold