Progressive Self-Boosting Anapole-Enhanced Deep-Ultraviolet Third Harmonic during Few-Cycle Laser Radiation

verfasst von

Liping Shi, Andrey B. Evlyukhin, Carsten Reinhardt, Ihar Babushkin, Vladimir A. Zenin, Sven Burger, Radu Malureanu, Boris N. Chichkov, Uwe Morgner, Milutin Kovacev

Abstract

Nanoantennas made of high-index semiconductors with a strong nonlinearity and supported optical Mie-type resonances offer a promising alternative platform for nonlinear nanophotonics. In this Letter, we employ an array of amorphous silicon nanodisks with varying diameters to produce a broadband deep-ultraviolet third harmonic of a few-cycle Ti:sapphire oscillator. Ultrashort light pulses efficiently deposit their energy at the center of the disks where the electric field is strongly amplified by the anapole states. This leads to a progressive material modification in an extreme multishot (>1010 pulses) and a rather low fluence (<10-3 J/cm2) regime, drastically differing from other known mechanisms, such as nonthermal plasma annealing or thermal melting-induced recrystallization. We suggest that the material modification is due to femtosecond laser-induced excitation of dangling bonds, which leads to a gradual boosting of the third harmonic conversion efficiency and broadening of its spectral bandwidth.

Organisationseinheit(en)

Institut für Quantenoptik
PhoenixD: Simulation, Fabrikation und Anwendung optischer Systeme
QuantumFrontiers

Externe Organisation(en)

Hochschule Bremen
Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (MBI)
University of Southern Denmark
Konrad-Zuse-Zentrum für Informationstechnik Berlin (ZIB)
Technical University of Denmark

Typ

Artikel

Journal

ACS PHOTONICS

Band

7

Seiten

1655-1661

Anzahl der Seiten

7

ISSN

2330-4022

Publikationsdatum

15.07.2020

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Elektronische, optische und magnetische Materialien, Biotechnologie, Atom- und Molekularphysik sowie Optik, Elektrotechnik und Elektronik

Elektronische Version(en)

https://doi.org/10.1021/acsphotonics.0c00753 (Zugang: Geschlossen)