Published/Posted: October 6, 2023

Authors: Mittendorff, Martin; Han, Jeong Woo; Winnerl, Stephan; Murphy, Thomas E.

DOI: 10.1117/12.2681999

Abstract: Graphene plasmonic elements enhance the light-matter interaction at resonance. Intense optical excitation results in a nonlinear response, based on two main causes: thermal effects and the Kerr effect. Here we present polarization dependent pump-probe experiments on graphene disks. Those revealed that both effects are similar in strength, though the Kerr nonlinearity is much faster, making it a candidate for efficient harmonic generation. Besides excitation with linear polarization, we investigated the impact of circularly polarized pump radiation. The circulating currents cause an effective quasi-static magnetic field perpendicular to the disks and thus Faraday rotation without the need of external magnetic field.

M. Mittendorff, J. W. Han, S. Winnerl and T. E. Murphy, "Graphene plasmonics for non-linear terahertz applications", SPIE OPTO, San Diego, CA (USA) PC126830H (2023)