Size-dependent nonlinear optical absorption in SnO<sub>2</sub> quantum dots
Shujala Parveen Sheikh, V. R. Reddy, Pratima Sen
Abstract
Using a Z-scan technique, we report size-dependent changeover from reverse saturable absorption to saturable nonlinear optical absorption properties of as-deposited and annealed stannic oxide semiconductor quantum dot thin films, prepared by a sol-gel technique on a quartz substrate. The average size of quantum dots, as obtained from grazing incident x-ray diffraction, was found to be in the range of the exciton Bohr radius. Atomic force microscopy data confirmed the spherical shape of quantum dots. The UV-Vis data of the films displayed bandgap enhancement due to the combined effect of Coulombic and confinement potentials. A density matrix analysis was conducted to obtain the transition energy-dependent nonlinear optical absorption coefficient in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mtext class="MJX-tex-mathit" mathvariant="italic">cw</mml:mtext> </mml:mrow> </mml:math> excitation regime. We found a qualitative agreement between the experimental observations and theoretical calculations.