2013
DOI: 10.1039/c3nr33860f
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Wavelength dependence of nonlinear optical properties of colloidal CdS quantum dots

Abstract: Wide wavelength range (550-1600 nm) measurements of nonlinear optical properties of ca. 5 nm CdS quantum dots (QDs) colloidal solution were performed using the Z-scan technique with femtosecond laser pulses at 1 kHz. Parameters characterizing nonlinear absorption and nonlinear refraction were determined. Nonlinear absorption has the character of a two-, three- and four-photon process depending on the wavelength range, with the values of the relevant coefficients peaking at 750 nm, 1200 nm and 1500 nm, respecti… Show more

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Cited by 58 publications
(59 citation statements)
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“…1,2 Among these properties, we can cite high molar absorptivity, 3,4 high uorescence quantum yield, 5,6 exceptional multiphoton absorption, [7][8][9][10][11] and strong electron-phonon coupling. 12,13 Because of these remarkable features, QDs are of great technological interest since they have been used in several applications, such as solar and photovoltaic cells, 14,15 luminescent biolabels, 16 inkjet printing light-emitting devices, 17 displays, 18 and RGB devices.…”
Section: Introductionmentioning
confidence: 99%
“…1,2 Among these properties, we can cite high molar absorptivity, 3,4 high uorescence quantum yield, 5,6 exceptional multiphoton absorption, [7][8][9][10][11] and strong electron-phonon coupling. 12,13 Because of these remarkable features, QDs are of great technological interest since they have been used in several applications, such as solar and photovoltaic cells, 14,15 luminescent biolabels, 16 inkjet printing light-emitting devices, 17 displays, 18 and RGB devices.…”
Section: Introductionmentioning
confidence: 99%
“…Interestingly, the nonlinear absorption spectra need not show any simple relation with the one-photon spectra: for instance, it has been reported that the maxima of nonlinear absorption do not correspond to the absorption edge in the one-photon absorption spectrum for CuInS 2 , 39 CdSe, 5 and CdS 40 samples. In summary, we have prepared PVP capped CuS nanoparticles and QDs which are highly dispersible in water, through a nontoxic, green, one-pot synthesis method.…”
mentioning
confidence: 99%
“…По нашему мнению, не стоит исключать также и влияние молекулярного окружения. Например, в работах [4][5][6] показано, что при исследованиях КТ CdS под действием фемтосекундных лазерных импульсов на длинах волн 750−800 нм величина γ (γ -нелинейный коэффициент рефракции связанных носителей, связан с нелинейным показателем преломления через соотноше-ние n 2 = cn 0 γ/40π [14], где c -скорость света, n 0 -линейный показатель преломления) отклонялась как в сторону больших, так и в сторону меньших значений в зависимости от матрицы окружения (см. обзорную таблицу в [6]).…”
Section: обсуждение результатовunclassified
“…Полупроводниковые квантовые точки (КТ), такие как CdS, обладают сильными нелинейными оптическими свойствами как при пикосекундном, так и при нано-секундном воздействии [1][2][3][4][5][6][7][8][9][10]. Нелинейные структуры, содержащие КТ в золях на основе поливинилпирроли-дона (PVP) или пленках, перспективны в оптическом ограничении лазерного излучения, а также представ-ляют интерес при разработке твердотельных нелиней-ных структур [2].…”
Section: Introductionunclassified
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