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Spectral Shifts of Nonadiabatic High-Order Harmonic Generation
Open AccessArticle

Laser Induced Multiphoton Effects in Nano-Graphene Molecules

Nanjing National Laboratory of Microstructures, Laboratory of Solid State Microstructures, andSchool of Physics, Nanjing University, Nanjing 210093, China
Department of Physics, Indiana State University, Terre Haute, IN 47809, USA
Author to whom correspondence should be addressed.
Appl. Sci. 2013, 3(1), 278-287;
Received: 28 November 2012 / Revised: 19 February 2013 / Accepted: 3 March 2013 / Published: 13 March 2013
(This article belongs to the Special Issue Ultraintense Ultrashort Pulse Lasers)
We perform first-principles calculations to study the high-order harmonic generation induced in graphene nanostructures by the laser field. Three distinct signals are noticed: the integer higher-order harmonic generation (HHG), the shifted fractional order peaks from the integer order harmonics, and the intrinsic emissions. Due to the small gap between HOMO and LUMO of graphene molecule, the HHG can be generated for the infrared laser pulse with the photon energy ranging from 20 meV to 1 eV. The intrinsic emission corresponds to the electron excitation between eigenstates. Using a laser pulse with a photon energy of 0.042 eV and amplitude of 0.2 V/A° , HHGs up to 19th order are identified. Unsaturated graphene molecule is an excellent media for HHG. Moreover, the HHG signals are very sensitive to the hydrogen passivation. Our results also indicate that HHG can be a promising method for detecting the product in the fabrication of graphene molecules. View Full-Text
Keywords: high harmonic generation; graphene; nonlinear processes high harmonic generation; graphene; nonlinear processes
MDPI and ACS Style

Gu, M.; Zhang, G.; Wu, X. Laser Induced Multiphoton Effects in Nano-Graphene Molecules. Appl. Sci. 2013, 3, 278-287.

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