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Near resonant and nonresonant third-order optical nonlinearities of colloidal InP/ZnS quantum dots
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10.1063/1.4776702
/content/aip/journal/apl/102/2/10.1063/1.4776702
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/2/10.1063/1.4776702
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Figures

Image of FIG. 1.
FIG. 1.

UV-visible absorption spectra and normalized one-photon induced PL spectra of QD548 (2.2 nm) (black) and QD606 (2.8 nm) (red). The inset shows the corresponding TEM images of QD548 and QD606.

Image of FIG. 2.
FIG. 2.

(a) Open-aperture Z-scan curves of QD548 (▪) and QD606 (●) at the optical wavelength of 527 nm and the input intensity of 5.5 GW/cm2. The solid lines in (a) are the fits according to Z-scan theory. (b) Normalized transmittance change versus the input intensity tuning from 3.3 to 37.5 GW/cm2 of QD548 (▪) and QD606 (●). (c) A plot of natural logarithm of the transmittance at the focus plane in intensity-dependent Z-scan as a function of input intensity of QD548 (▪) and QD606 (●).

Image of FIG. 3.
FIG. 3.

(a) Normalized two-photon excited PL of QD548 (black) and QD606 (red) excited at 800 nm. The corresponding two-photon excited PL images are shown in the inset. (b) Schematic diagram for the whole process of the one- and two-photon excited PL for QDs. (c) Log-log plots of the PL intensities as a function of excitation power at 800 nm. The red lines are the linear fittings. The slopes for QD606 and QD548 are 2.03 and 1.93, respectively. (d) Open aperture Z-scan curves of QD548 (▪), QD606 (●), and toluene (◆) at the wavelength of 800 nm and the input intensity of 45 GW/cm2. The solid lines are the fitting curves using Z-scan theory.

Image of FIG. 4.
FIG. 4.

CA/OA curves of Z-scan of QD548 (▪), QD606 (●), and toluene (◆) at the wavelength of 800 nm and the input intensity of 100 GW/cm2. The dotted lines are the fitting curves using Z-scan theory.

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/content/aip/journal/apl/102/2/10.1063/1.4776702
2013-01-18
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Near resonant and nonresonant third-order optical nonlinearities of colloidal InP/ZnS quantum dots
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/2/10.1063/1.4776702
10.1063/1.4776702
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