Abstract
Polarization-resolved forward degenerate four-wave mixing (DFWM) in a nonresonant region revealed the effective third-order nonlinear susceptibility of colloidal CdTe nanocrystals (NCs) with the size near the Bohr radius and various concentrations. The second hyperpolarizabilities, 〈 γ x x x x h 〉 and 〈 γ x y y x h 〉 , of the CdTe NCs were ∼1.15 × 10 −41 m 5/V 2 and ∼3.01 × 10 −42 m 5/V 2 from the measurement of the concentration-dependent third-order nonlinear susceptibility of CdTe NCs, respectively. The ratio ( 〈 γ x y y x h 〉 / 〈 γ x x x x h 〉 ) of the hyperpolarizabilities was ∼0.26, which indicated a large contribution of an electronic polarization process to the third-order nonlinearity of CdTe NCs.
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