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

摘要

Resonant third-order nonlinear optical susceptibility and hyperpolarizability of CdSe nanocrystal quantum dots were revealed to be approximately 2.6 10(exp -20) 2.7 10(exp -19) sq m/V2 and approximately 2.2 10(exp -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.