Optics and Spectroscopy (English translation of Optika i Spektroskopiya), volume 130, issue 3, pages 224-231
Transient Absorption Dynamics and Nonlinear Optical Response in Colloidal Ag2S Quantum Dots
M. S. Smirnov
1
,
O. V. Ovchinnikov
1
,
A. I. Zvyagin
1
,
S. A. Tikhomirov
2
,
A. N. Ponyavina
2
,
V A Povedailo
2
,
Nguyen Thanh Binh
3
,
Pham Hong Minh
3
2
Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk, Belarus
|
Publication type: Journal Article
Publication date: 2022-03-01
Q4
Q4
SJR: 0.177
CiteScore: 1.6
Impact factor: 0.8
ISSN: 0030400X, 15626911
Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Abstract
The mechanism of the nonlinear optical response of colloidal solutions of Ag2S quantum dots passivated with thioglycolic acid molecules is considered. Appearance of nonlinear absorption and nonlinear refraction is shown by the Z-scan method using 10-ns pulses of the second harmonic of a Nd:YAG laser. The absorption coefficient dependence was found to saturate with increasing incident radiation intensity. It is suggested that nonlinear absorption occurs with participation of the localized states of structural defects in Ag2S, including the defect luminescence center, which is confirmed by femtosecond transient absorption spectroscopy. A broad structureless transient absorption band is observed in the range of 500–1000 nm, which decays on a time scale of picoseconds. It is concluded that the transient absorption signal is caused by fast (fractions of picoseconds) capture of charge carriers by localized states, which then induce the nonlinear absorption of 10-ns pulses.
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Smirnov M. S. et al. Transient Absorption Dynamics and Nonlinear Optical Response in Colloidal Ag2S Quantum Dots // Optics and Spectroscopy (English translation of Optika i Spektroskopiya). 2022. Vol. 130. No. 3. pp. 224-231.
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Smirnov M. S., Ovchinnikov O. V., Zvyagin A. I., Tikhomirov S. A., Ponyavina A. N., Povedailo V. A., Binh N. T., Minh P. H. Transient Absorption Dynamics and Nonlinear Optical Response in Colloidal Ag2S Quantum Dots // Optics and Spectroscopy (English translation of Optika i Spektroskopiya). 2022. Vol. 130. No. 3. pp. 224-231.
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TY - JOUR
DO - 10.1134/s0030400x22030146
UR - https://doi.org/10.1134/s0030400x22030146
TI - Transient Absorption Dynamics and Nonlinear Optical Response in Colloidal Ag2S Quantum Dots
T2 - Optics and Spectroscopy (English translation of Optika i Spektroskopiya)
AU - Smirnov, M. S.
AU - Ovchinnikov, O. V.
AU - Zvyagin, A. I.
AU - Tikhomirov, S. A.
AU - Ponyavina, A. N.
AU - Povedailo, V A
AU - Binh, Nguyen Thanh
AU - Minh, Pham Hong
PY - 2022
DA - 2022/03/01
PB - Pleiades Publishing
SP - 224-231
IS - 3
VL - 130
SN - 0030-400X
SN - 1562-6911
ER -
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@article{2022_Smirnov,
author = {M. S. Smirnov and O. V. Ovchinnikov and A. I. Zvyagin and S. A. Tikhomirov and A. N. Ponyavina and V A Povedailo and Nguyen Thanh Binh and Pham Hong Minh},
title = {Transient Absorption Dynamics and Nonlinear Optical Response in Colloidal Ag2S Quantum Dots},
journal = {Optics and Spectroscopy (English translation of Optika i Spektroskopiya)},
year = {2022},
volume = {130},
publisher = {Pleiades Publishing},
month = {mar},
url = {https://doi.org/10.1134/s0030400x22030146},
number = {3},
pages = {224--231},
doi = {10.1134/s0030400x22030146}
}
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Smirnov, M. S., et al. “Transient Absorption Dynamics and Nonlinear Optical Response in Colloidal Ag2S Quantum Dots.” Optics and Spectroscopy (English translation of Optika i Spektroskopiya), vol. 130, no. 3, Mar. 2022, pp. 224-231. https://doi.org/10.1134/s0030400x22030146.