期刊
NANOSCALE
卷 11, 期 29, 页码 13988-13995出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr04337c
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资金
- National Key R&D Program of China [2018YFB1107200]
- National Natural Science Foundation of China [51772270, 51802285, 61435003, 61722503]
- Open Funds from State Key Laboratory of High Field Laser Physics (Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Science)
- State Key Laboratory of Precision Spectroscopy (East China Normal University)
- Natural Science Foundation of Zhejiang Province [LQ18A040004]
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [2018-skllmd-13]
Heavily doped oxide semiconductors can be tailored for widespread application in near-infrared (NIR) and mid-infrared (mid-IR) wavelength ranges because of both functional and fabrication advantages. Here, the ultrafast and broadband nonlinear saturable absorption of Al-doped zinc oxide nanocrystals (AZO NCs) is investigated by using the Z-scan technique and the pump-probe technique. The nonlinear absorption coefficient is as high as -1.90 x 10(3) cm GW(-1) in the wide infrared (IR) wavelength range (from 800 to 3000 nm). Furthermore, a maximum optically induced refractive index of -1.85 x 10(-1) cm(2) GW(-1) in the dielectric region and 2.09 x 10(-1) cm(2) GW(-1) in the metallic region leads to an ultrafast nonlinear optical response (less than 350 femtoseconds). Mode-locked fiber lasers at 1064 nm and 1550 nm as well as Q-switched fiber lasers near 2000 nm and 3000 nm prove the use of employing AZO NCs as a broadband and ultrafast nonlinear optical device, which provides a valuable strategy and intuition for the development of nanomaterial-based photonic and optoelectronic devices in the NIR and mid-IR wavelength ranges.
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