We report the observation of nonlinear-optical response and relaxation in copper indium sulfide crystalline nanoparticles and nanorods with femtosecond Z-scans and transient absorption measurements. Dependent on the size and shape, two-photon absorption and saturation in the one-photon absorption manifest themselves in these measurements as laser excitation wavelength of 780 nm is in the proximity of the lowest-lying excitonic energy, particularly for the nanorods. The transient absorption measurements by both one-photon and two-photon excitation reveal that electron-hole recombination is faster in smaller nanoparticles, or in nanorods with smaller aspect ratio. However, the decay to trapping states is independent of the size and aspect-ratio.
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Research Article| November 18 2009
Shape-dependent nonlinear absorption and relaxation in nanocrystals
Sudip K. Batabyal;
Jagadese J. Vittal;
N. Venkatram, Sudip K. Batabyal, Lu Tian, Jagadese J. Vittal, Wei Ji; Shape-dependent nonlinear absorption and relaxation in nanocrystals. Appl. Phys. Lett. 16 November 2009; 95 (20): 201109. https://doi.org/10.1063/1.3266518
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