Large Resonant Third-order Optical Nonlinearity of CdSe Nanocrystal Quantum Dots

Abstract

Resonant third-order nonlinear optical susceptibility and hyperpolarizability of CdSe nanocrystal quantum dots were revealed to be ∼2.6×10−20 – 2.7×10−19 m2/V2 and ∼2.2×10−40 m5/V2 by using nanosecond degenerate four-wave mixing at 532 nm. The large nonlinearity of the CdSe nanocrystals is attributed to the resonant excitation and multiple nonlinear optical processes.