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Articles

Switch of Optical Nonlinear Absorption in Black Phosphorous

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Pages 32-40 | Received 18 Jun 2019, Accepted 03 Feb 2020, Published online: 07 Apr 2020
 

Abstract

Nonlinear absorption of multi-layer black phosphorus nanosheets (BPs) were investigated using open aperture Z-scan method with 6 ns nanosecond laser pulses at 532 nm. It was found that, at lower intensities, BPs behave as saturable absorbers, but at higher intensities a shift from saturable absorption to reverse saturable absorption occurs. The transition process was analyzed in terms of the bleaching of ground-state and the excited-state absorption. We investigate the ultrafast dynamics by using pump − probe technique. The investigation implies that BPs has great potential applications in both mode-locking and optical liming in the visible range for ultrafast laser pulses.

Additional information

Funding

This work was supported by the Heilongjiang Province Natural Science Fund (F2018027), Heilongjiang University Graduate Innovation Fund (YJSCX2018-015HLJU), East University of Heilongjiang Scientific Research Fund (HDFHX170115), East University of Heilongjiang Scientific Research Fund (HDFKY190106).

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