The second hyperpolarizability of CdTe nanocrystals using polarization-resolved degenerate four-wave mixing |
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| Authors: | S.M. Ma Q. Yang L. Creekmore B. Tabibi |
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| Affiliation: | a Department of Physics, Hampton University, Hampton, VA 23668, USA
b Department of Chemistry, Rice University, Houston, TX 77005, USA |
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| 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,  and  , of the CdTe NCs were ∼1.15 × 10−41 m5/V2 and ∼3.01 × 10−42 m5/V2 from the measurement of the concentration-dependent third-order nonlinear susceptibility of CdTe NCs, respectively. The ratio ( / ) 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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| Keywords: | 42.70.Nq 78.66.Hf 78.67.Bf 78.67.Hc |
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