Dependence of nonlinear optical properties of Ag2S@ZnS core-shells on Zinc precursor and capping agent

Dehghanipour, M.; Khanzadeh, Mohammad; Karimipour, Masoud; Molaei, M.

doi:10.1016/j.optlastec.2017.10.023

Cited by 28 publications

(11 citation statements)

References 22 publications

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“…According to these results and comparison of NLO properties in two wavelengths, the χ ሺଷሻ of sample at λ = 532 nm is higher than λ = 405 nm which is due to the greater contribution of real part of χ ሺଷሻ in absolute value of χ ሺଷሻ . The NLA coefficient and NLR index of compound A in this research were obtained ሺ0.81 − 2.75ሻ × 10 ିଷ ୡ୫ and −ሺ11.7 − 42.7ሻ × 10 ିଽ ୡ୫ మ , respectively which are higher than the reported NLO coefficients of graphene oxide (GO) and GO-Ag 2 S@ZnS [22], graphene suspended in the water [42] and Ag 2 S@ZnS core-shells [44]. Also the NLA coefficient of Tris(2',2-bipyridyl)iron(II) tetrafluoroborate [43] and GO and reduced graphene oxide (rGO) derivatives reported in Ref.…”

Section: Resultscontrasting

confidence: 63%

Wavelength-dependent nonlinear optical properties of 8-(4-methoxyphenyl)-6-oxo-3-p-tolyl-6H-pyrido[1,2-b][1,2,4]triazine-7,9-dicarbonitrile

et al. 2018

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In this study, 8-(4-methoxyphenyl)-6-oxo-3-p-tolyl-6H-pyrido[1,2-b][1,2,4]triazine-7,9-dicarbonitrile (A) was prepared and then the nonlinear optical properties of this compound, including nonlinear refractive index (n2) and nonlinear absorption coefficient (β) were measured using Z-scan technique by continuous wave laser diode at wavelengths of 405 and 532 nm. At wavelength of 532 nm, by increasing the incident intensity a switch over from saturable absorption (SA) to reverse saturable absorption (RSA) was observed. The results showed that the nonlinear optical properties of this compound depend on the wavelength. It was also observed that with decreasing incident intensity, the thermal nonlinear refractive coefficient increased accordingly, while its thermo-optic coefficient decreased. In addition, the third-order susceptibility of this compound in wavelength of 532 nm was obtained higher than 405 nm.

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Section: Resultscontrasting

confidence: 63%

Wavelength-dependent nonlinear optical properties of 8-(4-methoxyphenyl)-6-oxo-3-p-tolyl-6H-pyrido[1,2-b][1,2,4]triazine-7,9-dicarbonitrile

et al. 2018

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“…Нестехиометричность сульфида серебра сильно усложняет синтез и требует тщательного подбора условий кристаллизации, типов лигандов и т. д. Критерии однозначного отнесения типа свечения образцов различного размера и состава интерфейсов пока не установлены. Имеется значительное количество работ, в которых методом Z-сканирования обнаружено нелинейное поглощение для лазерных импульсов различной длительности [26,27]. Однако механизм нелинейного поглощения в коллоидных КТ Ag 2 S остается предположительным -обсуждаются как двухфотонное поглощение, так и обратное насыщающееся поглощение [8,25].…”

Section: Introductionunclassified

Динамика наведенного поглощения и нелинейно-оптический отклик в коллоидных квантовых точках Ag-=SUB=-2-=/SUB=-S

Смирнов¹,

Овчинников²,

Звягин³

et al. 2022

Оптика И Спектроскопия

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The mechanism of formation of the nonlinear optical response of colloidal solutions of Ag2S quantum dots passivated with thioglycolic acid molecules is considered. Using the Z-scan method for 10 ns pulses of the second harmonic of a YAG:Nd laser, the appearance of nonlinear absorption and nonlinear refraction is shown. A saturating dependence of the absorption coefficient with an increase in the intensity of the incident radiation is found. An assumption was made about the participation in the process of nonlinear absorption of localized states of levels of Ag2S structural defects, including the defect luminescence center, which was confirmed by femtosecond induced absorption spectroscopy. The formation of a broad structureless induced absorption band in the 500–1000 nm region is shown, which decays on a time scale of hundreds of picoseconds. It is concluded that the induced absorption signal is determined by the fast (within fractions of picoseconds) process of charge carrier capture by localized states, which subsequently determine the nonlinear absorption of 10 ns pulses.

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“…For example, strong nonlinear optical properties have been demonstrated in the case of binary nanocomposites (Ag 2 S-CuS, Ag 2 S-CdS, Ag 2 S-ZnS, Ag 2 S-graphene, etc. [ 9 , 10 , 11 ]).…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Optical Characterization of InP@ZnS Core-Shell Colloidal Quantum Dots Using 532 nm, 10 ns Pulses

et al. 2021

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InP@ZnS core-shell colloidal quantum dots (CQDs) were synthesized and characterized using the z-scan technique. The nonlinear refraction and nonlinear absorption coefficients (γ = −2 × 10−12 cm2 W−1, β = 4 × 10−8 cm W−1) of these CQDs were determined using 10 ns, 532 nm pulses. The saturable absorption (β = −1.4 × 10−9 cm W−1, Isat = 3.7 × 108 W cm−2) in the 3.5 nm CQDs dominated at small intensities of the probe pulses (I ≤ 7 × 107 W cm−2) followed by reverse saturable absorption at higher laser intensities. We report the optical limiting studies using these CQDs showing the suppression of propagated nanosecond radiation in the intensity range of 8 × 107–2 × 109 W cm−2. The role of nonlinear scattering is considered using off-axis z-scan scheme, which demonstrated the insignificant role of this process along the whole range of used intensities of 532 nm pulses. We discuss the thermal nature of the negative nonlinear refraction in the studied species.

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Dependence of nonlinear optical properties of Ag2S@ZnS core-shells on Zinc precursor and capping agent

Cited by 28 publications

References 22 publications

Wavelength-dependent nonlinear optical properties of 8-(4-methoxyphenyl)-6-oxo-3-p-tolyl-6H-pyrido[1,2-b][1,2,4]triazine-7,9-dicarbonitrile

Wavelength-dependent nonlinear optical properties of 8-(4-methoxyphenyl)-6-oxo-3-p-tolyl-6H-pyrido[1,2-b][1,2,4]triazine-7,9-dicarbonitrile

Динамика наведенного поглощения и нелинейно-оптический отклик в коллоидных квантовых точках Ag-=SUB=-2-=/SUB=-S

Nonlinear Optical Characterization of InP@ZnS Core-Shell Colloidal Quantum Dots Using 532 nm, 10 ns Pulses

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