Keywords
CdSe
exciton
heavy holes
light holes
Nanoplatelets
nonlinear absorption
optical amplification
Abstract
Nonlinear absorption features of CdSe nanoplatelets colloidal solutions with a thickness of 2.5 and 3.5 monolayers were experimentally studied depending on the concentration in the case of resonant stationary excitation by nanosecond laser pulses. An increase in the amplitude of differential transmission and absorption saturation intensity at the wavelengths of excitonic transitions associated with heavy holes was detected for two series of samples with increasing concentration of nanoplatelets in the colloidal solution and explained by the process of excitons phase space filling. For colloidal solutions of high-concentration nanoplatelets, a region of negative differential transmission values was revealed at a sufficiently high pump intensity and explained by the transition from the absorption saturation regime to the optical amplification regime.
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