Pulse shaping in the terahertz frequency range for the control of photo-excited carriers in graphene
arXiv:1710.09889 · doi:10.1364/JOSAB.35.003021
Abstract
The shape of a few-cycle terahertz (THz) laser pulse can be optimized to provide control over conduction band populations in graphene. To demonstrate this control in a theoretical way, a spectral parametrization of the driving pulse using -splines is used in order to obtain experimentally realistic pulses of bandwidth 30 THz. Optimization of the spectral shape is performed via differential evolution, using the -splines expansion coefficients as decision variables. Numerical results show the possibility of changing the carrier density in graphene by a factor of 4 for a fixed pulse energy. In addition, we show that it is possible to selectively suppress or enhance multi-photon absorption features by optimizing over narrow windows in reciprocal space. The application of pulse shaping to the control of scattering mechanisms in graphene is also discussed.
arXiv commentAccepted for publication in JOSA B: https://www.osapublishing.org/josab/upcoming_pdf.cfm?id=332603
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