Ultrafast control of grating-assisted light coupling to surface plasmons.
We demonstrate subpicosecond control over the coupling of free-space radiation to surface-plasmon polaritons using 830 and 500 nm period gold gratings. Thermal changes to the electron distribution following irradiation by 100 fs, 810 nm pulses produce a shift of the 570 nm plasmon resonance by approximately 0.75 nm with reflectivity change up to 6% and decay time of approximately 1 ps.
Rotenberg
Nir
N
Department of Physics and Institute for Optical Sciences, University of Toronto, 60 St. George Street, Toronto, Ontario, Canada. nrotenbe@physics.utoronto.ca
Betz
Markus
M
van Driel
Henry M
HM