Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 20: Optical Properties

HL 20.2: Vortrag

Dienstag, 2. April 2019, 14:15–14:30, H31

THz nonlinear optics in graphene ribbons — M. Mehdi Jadidi^1,2, Kevin M. Daniels¹, Rachel Myers-Ward³, D. Kurt Gaskill³, Jacob König-Otto^4,5, •Stephan Winnerl⁴, Andrei Shushkov¹, H. Dennis Drew¹, Thomas E. Murphy¹, and Martin Mittendorff^1,6 — 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.