Regensburg 2019 – wissenschaftliches Programm
HL 20.2: Vortrag
Dienstag, 2. April 2019, 14:15–14:30, H31
THz nonlinear optics in graphene ribbons — M. Mehdi Jadidi1,2, Kevin M. Daniels1, Rachel Myers-Ward3, D. Kurt Gaskill3, Jacob König-Otto4,5, •Stephan Winnerl4, Andrei Shushkov1, H. Dennis Drew1, Thomas E. Murphy1, and Martin Mittendorff1,6 — 1University of Maryland, College Park, USA — 2Columbia University, New York, USA — 3U. S. Naval Research Laboratory, Washington DC, USA — 4Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 5Technische Universität Dresden, Dresden, Germany — 6Universität Duisburg-Essen, Duisburg, Germany
Graphene plasmonics is an emerging field due the unique combination of spectral tunability, strong plasmonic resonance and low losses. Here we study the nonlinear optical properties of graphene bilayer ribbons, featuring a plasmonic resonance at 3.9 THz, in time resolved experiments. A redshift of the plasmonic resonance is observed upon excitation with picosecond THz pulses. The unconventional nonlinear effect is explained by the optical response of hot carriers. Already at fairly low fluences in the µJ/cm2 range strong changes in transmission in the 10 % range can be induced. This strong response, together with the fast recovery determined by the electron cooling time (∼10 ps), makes the system promising for optical switching applications.