Tunable nonlinear optical enhancement of α-FeOOH nanorods/RGO composites
High-quality α-FeOOH nanorods/reduced graphene oxide (RGO) composites were prepared by a facile hydrothermal method. Crystal structure and optical properties of the composites were characterized by XRD, SEM, TEM, FT-IR, Raman, UV–vis, PL. These results of characterization showed that the composites...
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| Autores principales: | , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Elsevier
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/9281be4b5b994080b4558d2a787c560f |
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| Sumario: | High-quality α-FeOOH nanorods/reduced graphene oxide (RGO) composites were prepared by a facile hydrothermal method. Crystal structure and optical properties of the composites were characterized by XRD, SEM, TEM, FT-IR, Raman, UV–vis, PL. These results of characterization showed that the composites were successfully prepared. The third-order nonlinear optical (NLO) properties of the composites were investigated by Z-scan technique under 30 ps laser at 532 nm wavelength with 10 Hz repetition. The composites had larger third-order NLO susceptibility compared to pure α-FeOOH nanorods and RGO nanosheets. The enhancement of NLO performance benefited from synergistic effect of local field effect and charge transfer between α-FeOOH nanorods and RGO. Moreover, the composite with the α-FeOOH nanorods:RGO weight ratio of 2:1 (S3) showed the most robust NLO response. Comparing with RGO, the value of third-order NLO susceptibility χ(3) of S3 was increased by around 60 times and the saturation intensity Isat was nearly decreased by 6 times as the modulation depth M highly increased, respectively. The improved NLO property of α-FeOOH nanorods/RGO composite indicated its possible application in optical switches, mode lockers and other NLO devices. |
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