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 m 2/V2 and ∼2.2×10-40 m 5/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. © 2006 IOP Publishing Ltd.