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Issue 6, 2013
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Wavelength dependence of nonlinear optical properties of colloidal CdS quantum dots

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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, respectively. The order of the nonlinear processes was confirmed by measurements of the integral luminescence intensity vs. input excitation intensity. Maxima of the multi-photon absorption bands correspond to the second absorption band of the QDs. The maximum value of the two-photon absorption cross-section σ2 was estimated to be 7.2 × 10−47 cm4 s per QD at 750 nm.

Graphical abstract: Wavelength dependence of nonlinear optical properties of colloidal CdS quantum dots

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Publication details

The article was received on 28 Nov 2012, accepted on 17 Jan 2013 and first published on 21 Jan 2013


Article type: Paper
DOI: 10.1039/C3NR33860F
Citation: Nanoscale, 2013,5, 2388-2393
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    Wavelength dependence of nonlinear optical properties of colloidal CdS quantum dots

    J. Szeremeta, M. Nyk, D. Wawrzynczyk and M. Samoc, Nanoscale, 2013, 5, 2388
    DOI: 10.1039/C3NR33860F

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