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Thickness-dependent ultrafast nonlinear optical response of germanium selenide nanosheets.
- Source :
-
Journal of Materials Science . Jul2023, Vol. 58 Issue 28, p11527-11538. 12p. 1 Color Photograph, 2 Charts, 7 Graphs. - Publication Year :
- 2023
-
Abstract
- Germanium selenide (GeSe), a mono-sulfide compound of group VI elements, has a crystal and semiconductor structure similar to black phosphorus, which means that it is very promising for applications in nanophotonic devices. In this paper, we prepared 5 mg ml−1 GeSe nanosheet suspensions by liquid-phase exfoliation technique and centrifuged the suspensions at different speeds to obtain GeSe nanosheets with different layer numbers to investigate the effect of nanosheet layer numbers on the third-order nonlinear optical properties of GeSe nanosheets. AFM microscopy is used to show that the number of layers in a nanosheet can be controlled using differential centrifugation techniques. The structure and defects of the exfoliated nanosheets were analyzed based on the results of Raman spectroscopy and X-ray energy spectrometry. The open-aperture Z-scan technique revealed that the nonlinear absorption effect of the nanosheet changed from saturation absorption to reverse saturation absorption when the number of nanosheet layers was gradually reduced. The closed-aperture Z-scan technique reveals that the nonlinear refraction effect enhanced when the number of nanosheet layers is gradually reduced. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00222461
- Volume :
- 58
- Issue :
- 28
- Database :
- Academic Search Index
- Journal :
- Journal of Materials Science
- Publication Type :
- Academic Journal
- Accession number :
- 165467607
- Full Text :
- https://doi.org/10.1007/s10853-023-08748-1