Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 11: Ultrafast and Nonlinear Plasmonics
O 11.1: Talk
Monday, March 16, 2015, 15:00–15:15, MA 004
Surface plasmon polariton induced shortening of the optical response in perforated gold films — •Felix Spitzer1, Martin Pohl1, Boris A. Glavin2, Vladimir Belotelov3, Ilya Akimov1, Sachin Kasture4, Arvind S. Vengurlekar4, Achanta V. Gopal4, and Manfred Bayer1 — 1Technische Universität Dortmund, Dortmund, Germany — 2V.E. Lashkaryov Institute of Semiconductor Physics, Kiev, Ukraine — 3Lomonosov Moscow State University, Moscow, Russia — 4Tata Institute of Fundamental Research, Mumbai, India
Ultrafast relaxation dynamics of a laser-heated periodically perforated gold film are investigated using a femtosecond pump-probe technique with 30 fs pulses far from intrinsic gold resonances. The grating period is 595 nm with a thickness of 120 nm and 110 nm slit width. Changes of differential transmission are measured time- and angular-resolved and fitted afterwards using the nonequilibrium electron model to obtain the characteristic relaxation times. We observe, that the pump induced optical response becomes significantly shorter when the electrons in metal are excited with surface plasmon polaritons. These results uncover the role of thermal conductivity of electrons which becomes important in case of strongly inhomogeneous spatial distribution of hot carriers.