Open AccessTransverse phase matching of high-order harmonic generation in single-layer graphene
Author(s) -
Roberto Boyero-García,
Óscar Zurrón-Cifuentes,
Luis Plaja,
Carlos Hernández-García
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.412639
Subject(s) - graphene , high harmonic generation , optics , physics , phase (matter) , harmonic , scaling , beam (structure) , transverse plane , phase matching , materials science , quantum mechanics , laser , geometry , mathematics , structural engineering , engineering
The efficiency of high-harmonic generation (HHG) from a macroscopic sample is strongly linked to the proper phase matching of the contributions from the microscopic emitters. We develop a combined micro+macroscopic theoretical model that allows us to distinguish the relevance of high-order harmonic phase matching in single-layer graphene. For a Gaussian driving beam, our simulations show that the relevant HHG emission is spatially constrained to a phase-matched ring around the beam axis. This remarkable finding is a direct consequence of the non-perturbative behavior of HHG in graphene-whose harmonic efficiency scaling is similar to that already observed in gases- and bridges the gap between the microscopic and macroscopic HHG in single-layer graphene.