Abstract
The optical properties of graphene previously used to probe its electronic structure are its optical dispersion and absorption coefficients. Now, scientists report the third-harmonic generation of light in graphene and demonstrate the promise of this nonlinear optical response as a technically versatile microscopic imaging approach of the physical structure of graphene.
Highlights
Single-layer graphene has become a subject of intense interest and study because of its remarkable electronic, optical, mechanical, and thermal properties, combined with its unique electronic band structure [1,2,3,4]
We report strong third-harmonic generation in monolayer graphene grown by chemical vapor deposition and transferred to an amorphous silica substrate; the photon energy is in threephoton resonance with the exciton-shifted van Hove singularity at the M point of graphene
The wavelength of the TH spectrum centered at 263 Æ 4 nm and its I!3 power dependence fully confirm the nature of the nonlinearity of the signal
Summary
Single-layer graphene has become a subject of intense interest and study because of its remarkable electronic, optical, mechanical, and thermal properties, combined with its unique electronic band structure [1,2,3,4]. Despite its monolayer-to-few-layer thickness, graphene offers an array of properties that are of interest for optical physics and devices These properties include relatively flat optical absorption from around 0.5 to 1.5 eV, with a strong dopingdependent absorption edge and pronounced excitonic effects [5,6,7,8,9]; coupling of optical and mechanical properties in graphene membranes [10]; and plasmonic properties [11,12]. Such studies have underscored the importance of the linear optical properties of graphene [5,6,7,8,9,13,14,15].
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