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Optical gain from InAs nanocrystal quantum dots in a polymer matrix
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Absorption (solid line) and PL (dashed line) spectra of the InAs NQD-polymer film. The solid (dashed) arrow marks the spectral position of the prepump (resonant pump and probe) for the three-beam pump-probe experiments. (b) A schematic diagram of the three-beam pump-probe setup and the level diagram for the NQDs. For the conventional two-beam pump-probe measurements, the resonant pump beam is blocked.

Image of FIG. 2.
FIG. 2.

(a) Normalized probe transmission as a function of the prepump-probe delay for different prepump fluences in the two-beam geometry in which the resonant pump is not present. (b) Same as (a), but now the resonant pump pulse is used and delayed by with respect to the prepump (marked by the arrow). The dark lines present the corresponding two-beam pump-probe experimental traces with the resonant pump off. The dashed line (transparency line) marks the onset of gain. (c) Same data as in (b) presented as differential probe transmission due to the resonant pump.

Image of FIG. 3.
FIG. 3.

(a) Normalized probe transmission with different resonant pump delays, marked by the arrows. The dashed line (transparency line) marks the onset of gain. The prepump fluence is . (b) Probe differential transmission for two different probe and resonant pump wavelengths with a prepump fluence of and wavelength of .


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Scitation: Optical gain from InAs nanocrystal quantum dots in a polymer matrix