Abstract
We demonstrate strong optical nonlinearities of silver sulfide (Ag2S) quantum dots (QDs) in the ultraviolet range. The 4-nm Ag2S QDs were prepared by chemical method and analyzed using picosecond (800 nm and 400 nm, 200 ps) and femtosecond (800 nm and 400 nm, 60 fs) laser pulses. Our Z-scan measurements show that these QDs have large nonlinear absorption coefficient (~ 10−3 cm W−1) at 400 nm. We also demonstrate the transient absorption and optical limiting in Ag2S QDs. Variations of the signs of nonlinear refractive indices and nonlinear absorption coefficients of QDs are demonstrated by changing pulse width and wavelength of probe radiation.
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Acknowledgements
R.A.G. thanks the financial support from Chinese Academy of Sciences President’s International Fellowship Initiative (Grant no. 2018VSA0001).
Funding
National Natural Science Foundation of China (Grant nos. 91750205, 61774155); National Key Research and Development Program of China (2017YFB1104700).
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Fu, Y., Ganeev, R.A., Zhao, C. et al. Ag2S quantum dots in the fields of picosecond and femtosecond UV and IR pulses: optical limiting, nonlinear absorption and refraction properties. Appl. Phys. B 125, 1 (2019). https://doi.org/10.1007/s00340-018-7110-y
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DOI: https://doi.org/10.1007/s00340-018-7110-y