Berlin 2024 – scientific programme
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DS: Fachverband Dünne Schichten
DS 21: Optical Analysis of Thin Films
DS 21.4: Talk
Friday, March 22, 2024, 10:30–10:45, A 053
Synthesis, structure, and optical properties of Multi-Au capped Si nanoislands as a novel saturable absorber with a high modulation depth — Ali Karatutlu1, Umut Taylan1,2, •Zehra Gizem Mutlay1, and Bülend Ortaç1 — 1UNAM--Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, 06800-Turkey — 2Empa, Swiss Federal Laboratories for Materials Science & Technology, Laboratory for Advanced Materials Processing, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland
This study demonstrates the first-time synthesis of multi-Au capped nanoislands and its potential as a new non-linear hybrid material. The synthesis was conducted by a vapor-liquid-solid mechanism using a subsequent laser ablation and plasma-enhanced vapor deposition. The results are promising for the use of this material in non-linear optics as a saturable absorber and potential mode-locker due to a relatively high-modulation depth reaching around 15% measured using Ti-sapphire femtosecond (fs) laser light with a wavelength at 800 nm. The hybrid saturable absorber consisting of metallic and semiconductor structures was initially characterized using UV-Vis-NIR absorption and reflection spectroscopy, scanning electron microscopy, and transmission electron microscopy studies followed by a power-dependent transmission measurement of an fs light.
Keywords: Multi-Au capped Si nanoislands; vapor-liquid-solid mechanism; modulation-depth; saturable absorber; semiconductor thin films