Graphene plasmonics for non-linear terahertz applications

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

doi:10.1117/12.2681999

6 October 2023 Graphene plasmonics for non-linear terahertz applications

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

Proceedings Volume PC12683, Terahertz Emitters, Receivers, and Applications XIV; PC126830H (2023) https://doi.org/10.1117/12.2681999
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

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.

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Citation Download Citation

Martin Mittendorff, Jeong Woo Han, Stephan Winnerl, and Thomas E. Murphy "Graphene plasmonics for non-linear terahertz applications", Proc. SPIE PC12683, Terahertz Emitters, Receivers, and Applications XIV, PC126830H (6 October 2023); https://doi.org/10.1117/12.2681999

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KEYWORDS

Graphene

Plasmonics

Magnetism

Polarization

Thermal effects

Thermography

Resonance enhancement

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