Surface plasmon dynamics in arrays of subwavelength holes: the role of optical interband transitions.
Using femtosecond optical spectroscopy, we study the ultrafast dynamics of the surface plasmon polaritons in gold arrays of subwavelength holes. A large time dependent spectral broadening and shift of the surface plasmon resonances are reported. The experimental results are modeled by the diffraction of a transverse electromagnetic field through the nanostructure, taking into account both the electron dynamics near the interband transitions and the Drude-like conductivity of the metal. Our analysis, using either a theoretical or an experimentally determined dielectric function of gold, suggests that the losses propagation in plasmonic devices is strongly influenced by intrinsic and extrinsic electron scattering mechanisms.
Halté
V
V
IPCMS-GONLO, UMR 7504 CNRS/ULP, Strasbourg, France. halte@ipcms.u-strasbg.fr
Benabbas
A
A
Bigot
J-Y
JY
D003198:Computer Simulation; D006046:Gold / Q000737:chemistry*; D008027:Light; D008962:Models, Theoretical; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000379:methods*
D006046:Gold