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Nonperturbative Generation of Harmonics by Nanometer-Scale Localized Electronic States on the Surface of Bulk Materials and Nano-Films

Authors :
Jozsef Seres
Enikoe Seres
Eva Céspedes
Leyre Martinez-de-Olcoz
Miguel Zabala
Thorsten Schumm
Source :
Optics; Volume 4; Issue 1; Pages: 246-257
Publication Year :
2023
Publisher :
MDPI AG, 2023.

Abstract

The generation of high-order harmonics in solid crystals has received considerable attention recently. Using a driver laser with 0.8 µm wavelength and 28 fs ultrashort pulses, we present experimental results, accompanied with theoretical considerations, suggesting that the actual sources of the harmonics are nanometer-sized localized and transient electronic states on the surface of the materials when the laser intensity is in the non-perturbative regime. Adaptation of the bond model of the harmonic generation into the non-perturbative regime and including the quantum features of the process provide a localized excitation approach that correctly describes the measured polarization dependence of the harmonic signal, reflecting the microscopic surface structure and symmetries of the examined materials.

Details

ISSN :
26733269
Volume :
4
Database :
OpenAIRE
Journal :
Optics
Accession number :
edsair.doi.dedup.....526c762bcacb3c48d297b8409cde4363
Full Text :
https://doi.org/10.3390/opt4010017