Regensburg 2010 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 61: Poster II: Materials, Interfaces and Heterostructures

HL 61.6: Poster

Donnerstag, 25. März 2010, 18:00–20:00, Poster D1

First observation of the strong nonlinear optical response of graphene measured by four-wave mixing — Euan Hendry¹, Peter Hale¹, Julian Moger¹, Alexander Savchenko¹, and •Sergey Mikhailov² — ¹School of Physics, University of Exeter, UK — ²Institute of Physics, University of Augsburg, Germany

We present the first experimental investigation of nonlinear optical properties of graphene at visible and near infrared frequencies measured by four-wave mixing technique. It is shown that graphene produces strong third-order nonlinear optical response, described by nonlinear susceptibility comparable to that of other strongly nonlinear materials, such as carbon nanotubes. In contrast to carbon nanotubes, however, this nonlinear response is essentially dispersionless over the wavelength range in our experiments (emission with wavelength of 760 - 840 nm). We show that the nonlinear response of graphene can be exploited for high-contrast optical imaging of flakes: the image contrasts for monolayer flakes on a dielectric substrate are several orders of magnitude higher than those in reflection microscopy.

This work was funded by the RCUK, EPSRC and Deutsche Forschungsgemeinschaft.