Abstract
We theoretically investigate high-order harmonic generation from nanowire in inhomogeneous laser field. By solving the time-dependent Schrodinger equation, the simulated harmonic spectrum exhibits a double-plateau structure. The cutoff of the second plateau is extended and the intensity of the high-order harmonics in the second plateau is increased by about two to three orders of magnitude compared with that from the homogeneous laser field. Moreover, we analyze the influence of the inhomogeneous laser field polarization orientation to the nanowire. It is shown that the intensity of the high-order harmonics in the second plateau can be effectively controlled by varying the inhomogeneity parameter and the laser field polarization orientation to the nanowire. These phenomena are attributed to the time-dependent population of the electron, which has a strong relevance with the intensity of the harmonic.
Highlights
Over the past several decades, high-order harmonic generation (HHG) in gases has been extensively studied in both theory and experiment [1]–[4]
The results show that the intensity of the high-order harmonics in the second plateau can be controlled by varying the inhomogeneity parameter and the field polarization orientation to the nanowire
We note that only εx = εy has been shown in this paper since it is the best way to enhance harmonic efficiency
Summary
Over the past several decades, high-order harmonic generation (HHG) in gases has been extensively studied in both theory and experiment [1]–[4]. Plasmonic enhancements induced by the bow-tie nanostructures, named the spatially inhomogeneous field, have attracted much attention both in theory [46]–[48] and experiment [49], [50] In this scheme, the intensity of the driving laser field can be increased by more than two orders without addition of extra cavity. It is shown that by using a spatially inhomogeneous laser field, the harmonic cutoff of the second plateau is extended and the intensity of the second plateau is enhanced by two to three orders of magnitude compared with the ones from the homogeneous field. The results show that the intensity of the high-order harmonics in the second plateau can be controlled by varying the inhomogeneity parameter and the field polarization orientation to the nanowire
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