High-order harmonic generation of H2+ in surface plasmon modulated chirped laser field

Shuo Yuan; Si-Yu Gao; Jian Wang; Ji-Cai Liu

doi:10.1117/12.3015821

29 December 2023 High-order harmonic generation of H₂⁺ in surface plasmon modulated chirped laser field

Shuo Yuan, Si-Yu Gao, Jian Wang, Ji-Cai Liu

Proceedings Volume 12975, 6th Optics Young Scientist Summit (OYSS 2023); 129750V (2023) https://doi.org/10.1117/12.3015821
Event: 6th Optics Young Scientist Summit, 2023, Changsha, China

Abstract

We study here the high-order harmonic generation (HHG) from the hydrogen molecular ion H₂⁺ aligned along the axis of a golden nanotip. The whole system is shined by a chirped laser pulse with its wavelength centered at 800nm. Due to the existence of the metallic nanotip, the light field experienced by the molecular ion is strongly enhanced owing to the generation of the local surface plasmon field. It is found that the cutoff position and the conversion efficiency of HHG depend strongly on the distance between the nanotip and the molecular ion, as well as on the chirp parameter of the input infrared laser field. The plateau of the HHG is largely extended with negative chirps, and the supercontinuum spectra that can support a single attosecond pulse are generated by the suppression of the long electron trajectory with an optimized field chirp parameter.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Shuo Yuan, Si-Yu Gao, Jian Wang, and Ji-Cai Liu "High-order harmonic generation of H₂⁺ in surface plasmon modulated chirped laser field", Proc. SPIE 12975, 6th Optics Young Scientist Summit (OYSS 2023), 129750V (29 December 2023); https://doi.org/10.1117/12.3015821

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