DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 18: Plasmonics and Nanooptics II: Ultrafast and Nonlinear Phenomena (joint session O/CPP)

O 18.10: Vortrag

Montag, 16. März 2020, 17:30–17:45, WIL A317

fluctuation-modulated third harmonic deep ultraviolet emission from randomly disordered Si nanograss — •Juemin Yi1, Dong wang2, Jinhui Zhong1, Peter Schaaf1, Erich Runge3, and Christoph Lienau11Carl von Ossietzky Universität, Institut für Physik and Center of Interface Science, 26129 Oldenburg — 2TU Ilmenau, Institut für Werkstofftechnik und IMN MacroNano, 98693 Ilmenau — 3TU Ilmenau, Institut für Physik und IMN MacroNano, 98693 Ilmenau

It is well known that Si nanograss or black Si greatly enhances light absorption in a broad spectral range and thus is of relevance for solar cell application. Very little is known about their nonlinear optical properties. For that, we have utilized a broadband and few-cycle ultrafast laser to generate coherent third harmonic (TH) emission from randomly disordered Si nanograss. The TH signal is two-order-of-magnitude stronger than that from bulk Si surfaces. For individual hot spots, the TH enhancement even reaches a factor of the order of 1000. A statistical analysis of the TH intensity fluctuations demonstrates that multiple light scattering within the randomly disorder medium is the cause of those fluctuations. A phase-locked and collinear pulse pair excitation proves the coherent nature of the deep ultraviolet emission. The interferometric frequency-resolved autocorrelation (IFRAC) microscopy shows that the deep ultraviolet pulse is around 10fs. Our findings identify random Si nanograss as the most promising candidates for generating ultrashort deep ultraviolet pulses.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2020 > Dresden