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JIA LIU1, HAILONG YU1, SHUANG YANG1, YACHEN GAO1,*
Optical nonlinear absorption and ultrafast carrier dynamics in 20 nm gold nanoparticles (NPs) were studied using open-aperture (OA) Z-scan technique and transient absorption spectroscopy. In the OA Z-scan, the gold NPs were observed to exhibit broadband saturable absorption (SA) in the range of 475 ~ 600 nm under different excitation wavelengths and energies, and the SA was energy-dependent. The underlying physical mechanism was explained in terms of ground-state bleaching, and relevant optical parameters of the nonlinear absorption were obtained via theoretical analysis. In addition, the ultrafast dynamics of gold NPs were studied in the resonant and non-resonant regions using femtosecond pump-probe technology. It was observed that, for a certain pump fluence, the decay time becomes increase with the extension of the probe wavelength. These results indicate that gold nanomaterials have potential applications and significant value in laser Q-tuning and mode-locking.
Gold nanoparticles, Carrier dynamics, Broadband, Optical nonlinear absorption, Saturable absorption.
JIA LIU, HAILONG YU, SHUANG YANG, YACHEN GAO, Broadband saturable absorption and ultrafast carrier dynamics of gold nanoparticles, Optoelectronics and Advanced Materials - Rapid Communications, 18, 11-12, November-December 2024, pp.540-546 (2024).
Submitted at: June 27, 2024
Accepted at: Dec. 2, 2024
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
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