You, JW;
You, J;
Weismann, M;
Panoiu, NC;
(2017)
Double-resonant enhancement of third-harmonic generation in graphene nanostructures.
Philosophical Transactions of the Royal Society A - Mathematical Physical and Engineering Sciences
, 375
(2090)
, Article 20160313. 10.1098/rsta.2016.0313.
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Abstract
Intriguing and unusual physical properties of graphene offer remarkable potential for advanced, photonics-related technological applications, particularly in the area of nonlinear optics at the deep-subwavelength scale. In this study, we use a recently developed numerical method to illustrate an efficient mechanism that can lead to orders of magnitude enhancement of the third-harmonic generation in graphene diffraction gratings. In particular, we demonstrate that by taking advantage of the geometry dependence of the resonance wavelength of localized surface-plasmon polaritons of graphene ribbons and discs one can engineer the spectral response of graphene gratings so that strong plasmonic resonances exist at both the fundamental frequency and third-harmonic (TH). As a result of this double-resonant mechanism for optical near-field enhancement, the intensity of the TH can be increased by more than six orders of magnitude.
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