High Harmonic Generation Driven by Counter-Rotating Bicircular Laser Fields from Polar Chemical Bonds in h-BN

Abstract

High harmonic generation (HHG) driven by counter-rotating bicircular (CRB) pulses excitation has been observed from several solid targets, where circularly polarized harmonics are emitted. We study this process using time-dependent density functional theory (TDDFT) to calculate the crystal orientation dependence of the circularly polarized high harmonics from a monolayer h-BN. The resulted can be interpreted by the real space electron dynamics of electrons in polar chemical bonds. The yield of circularly polarized high harmonics (CHHs) can be optimized by controlling the direction of valence electron dynamics. Our findings pave the way for exploring the binding potential from spectrum and all-optically processing information.

High-Order Harmonic Generation in 1D Single-Wall Carbon Nanotubes

“…Particularly, HHG from solid targets has incited significant interest due to their higher density, which engenders a qualitative enhancement in harmonic conversion efficiency, a consequence of the coherent nature of the process [32][33][34][35][36]. Currently, there has been a burgeoning interest in understanding the nonlinear optical response of lower-dimensional materials, such as 2D graphene [37][38][39][40][41][42][43][44][45][46][47], silicene [48], MoS 2 [49], or hBN [50][51][52], and 1D silicon nanotubes [53] or CNTs [54][55][56]. For instance, the generation of up to the 9th harmonic in gapless graphene has been observed using a mid-infrared driving laser [57,58].…”