Das Suchergebnis hat sich seit Ihrer Suchanfrage verändert. Eventuell werden Dokumente in anderer Reihenfolge angezeigt.
  • Treffer 9 von 75
Zurück zur Trefferliste

Femtosecond laser-induced periodic surface structures: recent approaches to explain their sub-wavelength periodicities

  • The formation of laser-induced periodic surface structures (LIPSS) upon irradiation of semiconductors and dielectrics by linearly polarized high-intensity Ti:sapphire fs-laser pulses (τ ~100 fs, λ ~800 nm) is studied experimentally and theoretically. In the experiments, two different types of LIPSS exhibiting very different spatial periods are observed (socalled LSFL – low spatial frequency LIPSS, and HSFL - high spatial frequency LIPSS), both having a different dependence on the incident laser fluence and pulse number per spot. The experimental results are analyzed by means of a new theoretical approach, which combines the generally accepted LIPSS theory of J. E. Sipe and co-workers [Phys. Rev. B 27, 1141-1154 (1983)] with a Drude model, in order to account for transient changes of the optical properties of the irradiated materials. The joint Sipe-Drude model is capable of explaining numerous aspects of fs-LIPSS formation, i.e., the orientation of the LIPSS, their fluence dependenceThe formation of laser-induced periodic surface structures (LIPSS) upon irradiation of semiconductors and dielectrics by linearly polarized high-intensity Ti:sapphire fs-laser pulses (τ ~100 fs, λ ~800 nm) is studied experimentally and theoretically. In the experiments, two different types of LIPSS exhibiting very different spatial periods are observed (socalled LSFL – low spatial frequency LIPSS, and HSFL - high spatial frequency LIPSS), both having a different dependence on the incident laser fluence and pulse number per spot. The experimental results are analyzed by means of a new theoretical approach, which combines the generally accepted LIPSS theory of J. E. Sipe and co-workers [Phys. Rev. B 27, 1141-1154 (1983)] with a Drude model, in order to account for transient changes of the optical properties of the irradiated materials. The joint Sipe-Drude model is capable of explaining numerous aspects of fs-LIPSS formation, i.e., the orientation of the LIPSS, their fluence dependence as well as their spatial periods. The latter aspect is specifically demonstrated for silicon crystals, which show experimental LSFL periods Λ somewhat smaller than λ. This behaviour is caused by the excitation of surface plasmon polaritons, SPP, (once the initially semiconducting material turns to a metallic state upon formation of a dense free-electron-plasma in the material) and the subsequent interference between its electrical fields with that of the incident laser beam, resulting in a spatially modulated energy deposition at the surface. Upon multi-pulse irradiation, a feedback mechanism, caused by the redshift of the resonance in a grating-assisted SPP excitation, is further reducing the LSFL spatial periods. The SPP-based mechanism of LSFL successfully explains the remarkably large range of LSFL periods between ~0.6 λ and λ.zeige mehrzeige weniger

Volltext Dateien herunterladen

  • Femtosecond laser-induced periodic surface structures.pdf
    eng

Metadaten exportieren

Weitere Dienste

Teilen auf Twitter Suche bei Google Scholar
Metadaten
Autoren/innen:Jörn Bonse, A. Rosenfeld, Jörg Krüger
Persönliche Herausgeber/innen:V. Panchenko, G. Mourou, A. M. Zheltikov
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):LAT 2010 - International Conference on Lasers, Applications, and Technologies (Proceedings of SPIE)
Jahr der Erstveröffentlichung:2011
Herausgeber (Institution):International society for optics and photonics (SPIE)
Verlagsort:Bellingham, USA
Jahrgang/Band:7994
Erste Seite:79940M-1
Letzte Seite:79940M-10
Freie Schlagwörter:Dielectrics; Femtosecond laser ablation; Laser-induced periodic surface structures (LIPSS); Second harmonic generation (SHG); Semiconductors; Silicon; Surface plasmon polaritons
Veranstaltung:LAT 2010 - International Conference on Lasers, Applications, and Technologies
Veranstaltungsort:Kazan, Russia
Beginndatum der Veranstaltung:23.08.2010
Enddatum der Veranstaltung:26.08.2010
DOI:https://doi.org/10.1117/12.879813
ISSN:0277-786X
Bemerkung:
Serientitel: Proceedings of SPIE – Series title: Proceedings of SPIE
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:19.02.2016
Referierte Publikation:Nein