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