Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 11: Ultrafast and Nonlinear Plasmonics

O 11.1: Vortrag

Montag, 16. März 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.