AI Article Synopsis
- Optical harmonic generation involves high-intensity light interacting with nonlinear materials, leading to applications like tunable switches and frequency converters.
- Graphene has a strong ability to interact with light and can be tuned electrically for better nonlinear optical responses.
- By adjusting the Fermi energy and photon energy, the efficiency of third-harmonic generation in graphene can be drastically increased, allowing for wide-ranging applications in optical communications and signal processing.
Article Abstract
Optical harmonic generation occurs when high intensity light (>10 W m) interacts with a nonlinear material. Electrical control of the nonlinear optical response enables applications such as gate-tunable switches and frequency converters. Graphene displays exceptionally strong light-matter interaction and electrically and broadband tunable third-order nonlinear susceptibility. Here, we show that the third-harmonic generation efficiency in graphene can be increased by almost two orders of magnitude by controlling the Fermi energy and the incident photon energy. This enhancement is due to logarithmic resonances in the imaginary part of the nonlinear conductivity arising from resonant multiphoton transitions. Thanks to the linear dispersion of the massless Dirac fermions, gate controllable third-harmonic enhancement can be achieved over an ultrabroad bandwidth, paving the way for electrically tunable broadband frequency converters for applications in optical communications and signal processing.
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| http://dx.doi.org/10.1038/s41565-018-0145-8 | DOI Listing |
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