Title :
Imaging and characterization of femtosecond surface plasmon wave packets on a silver film
Author_Institution :
Inst. of Phys., Univ. of Tsukuba, Tsukuba, Japan
Abstract :
Irradiations of nano-structured metal films by ultrashort laser pulses excite surface plasmon wave packets, which propagate along the metal-dielectric interface for tens of femtoseconds. Recently developed novel time-resolved microscopic methods enable to take movies of the evolutions of them. We show photoemission electron microscopy and two-photon fluorescence microscopy, respectively combined with near-ultraviolet and near-infrared 10-femtosecond lasers, reveal dissipative propagations of wave packets launched from nano-scale slits formed in a silver film. The dynamical properties of wave packets such as group and phase velocities, and propagation lengths are well comparable to the values evaluated by using complex wavevectors of the surface plasmon polariton modes.
Keywords :
fluorescence; high-speed optical techniques; laser beam effects; metallic thin films; nanostructured materials; photoelectron microscopy; polaritons; silver; surface plasmons; Ag; complex wavevectors; dissipative propagations; femtosecond surface plasmon wave packets; metal-dielectric interface; nanostructured metal films; near-infrared 10-femtosecond lasers; near-ultraviolet 10-femtosecond lasers; photoemission electron microscopy; surface plasmon polariton modes; time-resolved microscopy; two-photon fluorescence microscopy; ultrashort laser pulse irradation; Films; Fluorescence; Microscopy; Optical surface waves; Plasmons; Surface waves; Ultrafast optics; femtosecond; microscopy; silver; surface plasmon; time-resolved; wave packet;
Conference_Titel :
Transparent Optical Networks (ICTON), 2012 14th International Conference on
Conference_Location :
Coventry
Print_ISBN :
978-1-4673-2228-7
Electronic_ISBN :
2161-2056
DOI :
10.1109/ICTON.2012.6254496
