Endohedral fullerenes: A way to control resonant high-order harmonic generation
Аннотация
We investigate the high-order harmonic generation in ordinary buckyball ${\mathrm{C}}_{60}$, endohedral In@C${}_{60}$ fullerene, and endohedral Sb@C${}_{60}$ fullerene by means of time-dependent density functional theory. In all cases the resonant enhancement of several high-order harmonics in the plateau region up to two orders of magnitude was predicted. Theoretical investigation of absorption spectra of ${\mathrm{C}}_{60}$ showed absorption peaks in the regions of the resonant HHG enhancement. In both endohedral fullerenes, peaks of plasmon absorption and resonance enhancement were shifted toward the corresponding atomic resonant transitions, which may be used to control the spectral distribution of groups of resonant harmonics and obtain bright attosecond pulse trains.