Effect of Band Gap on High-Frequency Harmonic Generation during Interaction of Laser Pulses with Structural Analogs of Graphene
Anatolii D. Panferov
Saratov State University, Saratov, Russia
Abstract
High-frequency harmonic generation during nonlinear interactions of electromagnetic radiation with condensed media has great potential for practical application and is the subject of intensive research. Of particular interest are such effects in graphene and its structural analogs with a finite band gap.
A method based on the quantum kinetic equation demonstrated the possibility of modeling the ultrafast dynamics of electrons in graphene under strong electric fields. It allows one to reproduce the observed characteristics of such processes, including the spectrum of radiation generated by surface currents. Generalization of the model used for this purpose by introducing a band gap of a specified width made it possible to study the effect of this parameter on the observed characteristics of the process. The orthogonal incidence of short linearly polarized laser pulses on the plane of the sample is modeled. In particular, the simultaneous action of two pulses with different parameters and orthogonal planes of polarization is considered.
The obtained results make it possible to determine the efficiency of high-frequency harmonic generation depending on the parameters of the acting field for materials with different values of the band gap width.
Speaker
Anatolii
Saratov State University
Russia
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