Berlin 2024 – scientific programme
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DS: Fachverband Dünne Schichten
DS 20: Poster II
DS 20.10: Poster
Thursday, March 21, 2024, 18:00–20:30, Poster D
Electric-field induced SHG (EFISHG) in graphene? — •Jonas Woeste1,5, Klaas-Jan Tielrooij2,3, Sergey Kovalev4, Nikola Stojanovic5, and Michael Gensch5,1 — 1Institut für Optik und Atomare Physik, Technische Universität Berlin, Berlin, Germany. — 2Catalan Institute of Nanoscience and Nanotechnology (ICN2), BIST and CSIC, Campus UAB, Bellaterra, Barcelona, Spain. — 3Department of Applied Physics, TU Eindhoven, Eindhoven, The Netherlands. — 4Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany. — 5DLR - Institute of Optical Sensor Systems, Berlin, Germany.
High harmonics generation (HHG) allows to study the nonlinear THz properties of e.g. single layer graphene by means of THz emission spectroscopy which can be explained by a simple thermodynamic model. Recently our collaboration successfully showed that (i) the nonlinearity of graphene can be controlled over two orders of magnitude by applying moderate gate voltages in the sub-Volt regime and (ii) that a specifically designed grating-graphene meta-material enables further increase in the THz nonlinearity via plasmonic field enhancement. Therein we have focused on odd-order nonlinearities, since monolayer graphene is a centrosymmetric material, where even-order susceptibilities cancel out. As a next step we plan to investigate if an effective 2nd order nonlinearity can be efficiently generated by applying appropriate in-plane DC electric fields, thus breaking the inversion symmetry, such as what has recently been demonstrated and observed in GaAs. Preparations for this experiment and its feasibility are discussed.
Keywords: Graphene; THz; HHG; SHG; 2D materials