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.Citation:
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)