Investigation on nonlinear optical properties of MoS2nanoflakes grown on silicon and quartz substrates
| Autor: | Samaneh Bayesteh, Ali Reyhani, Seyedeh Zahra Mortazavi |
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| Rok vydání: | 2018 |
| Předmět: |
History
Photoluminescence Materials science Acoustics and Ultrasonics Silicon Analytical chemistry Nanophotonics chemistry.chemical_element Chemical vapor deposition 02 engineering and technology Substrate (electronics) 010402 general chemistry 01 natural sciences Education symbols.namesake Monolayer Absorption (electromagnetic radiation) Quartz business.industry Saturable absorption 021001 nanoscience & nanotechnology Condensed Matter Physics Computer Science Applications 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry symbols Optoelectronics 0210 nano-technology Raman spectroscopy business |
| Zdroj: | Journal of Physics D: Applied Physics. 51:195302 |
| ISSN: | 1361-6463 0022-3727 |
| Popis: | In this study, MoS2 nanoflakes were directly grown on different substrates—Si/SiO2 and quartz—by one-step thermal chemical vapor deposition using MoO3 and sulfide powders as precursors. Scanning electron microscopy and x-ray diffraction patterns demonstrated the formation of MoS2 structures on both substrates. Moreover, UV-visible and photoluminescence analysis confirmed the formation of MoS2 few-layer structures. According to Raman spectroscopy, by assessment of the line width and frequency shift differences between the and A 1g, it was inferred that the MoS2 grown on the silicon substrate was monolayer and that grown on the quartz substrate was multilayer. In addition, open-aperture and close-aperture Z-scan techniques were employed to study the nonlinear optical properties including nonlinear absorption and nonlinear refraction of the grown MoS2. All experiments were performed using a diode laser with a wavelength of 532 nm as the light source. It is noticeable that both samples demonstrate obvious self-defocusing behavior. The monolayer MoS2 grown on the silicon substrate displayed considerable two-photon absorption while, the multilayer MoS2 synthesized on the quartz exhibited saturable absorption. In general, few-layered MoS2 would be useful for the development of nanophotonic devices like optical limiters, optical switchers, etc. |
| Databáze: | OpenAIRE |
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