High-order-harmonic generation by enhanced plasmonic near-fields in metal nanoparticles

摘要: We present theoretical investigations of high-order-harmonic generation (HHG) resulting from the interaction noble gases with localized surface plasmons. These plasmonic near-fields are produced when a metal nanoparticle is subject to few-cycle laser pulse. The enhanced field, which largely depends on geometrical shape metallic nanostructure, has strong spatial dependency. demonstrate that nonhomogeneity this field plays an important role in HHG process and leads significant increase harmonic-cutoff energy. In order understand characterize feature, we include functional form electric obtained recent attosecond streaking experiments [F. S\"u\ss{}mann M. F. Kling, Proc. SPIE 8096, 80961C (2011)] time-dependent Schr\"odinger equation. By performing classical simulations show consistency between them quantum-mechanical predictions. allow us origin extended harmonic spectra as selection particular trajectory sets. use nanoparticles alternate way generating coherent XUV light whose characteristics can be synthesized locally.