Optical power limiting in ensembles of colloidal Ag<sub>2</sub>S quantum dots
O. V. OvchinnikovVoronezh state university, Voronezh, RussiaM. S. SmirnovVoronezh state university, Voronezh, RussiaA. S. PerepelitsaVoronezh state university, Voronezh, RussiaT. S. ShatskikhVoronezh state university, Voronezh, RussiaB. I. ShapiroM.V. Lomonosov Moscow State Academy of Fine Chemical Technology, Moscow, Russian Federation
2015en
ABI
Annotatsiya
The effect of power limiting for optical radiation at a wavelength of 660 nm with a pulse duration of 10 ms and operation threshold of 2.2 – 3.1 mJ cm-2 is observed in ensembles of colloidal Ag2S quantum dots (QDs). Using the z-scanning method in an open-aperture scheme it is found that the power is limited mainly due to reverse saturable absorption caused by two-photon optical transitions that involve energy levels of Ag2S photoluminescence centres, related to structural impurity defects in colloidal Ag2S QDs. At the same time, the z-scanning in a closed-aperture scheme demonstrates the formation of a thermal dynamic lens.
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