Journal
JOURNAL OF APPLIED PHYSICS
Volume 104, Issue 7, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2990056
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Funding
- Cottrell College Award from Research Corporation [DMI-0613837, CMMI-0727713]
- International Research and Engineering Education subaward from NSF
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Saturable absorption (SA) and reverse saturable absorption (RSA) at 532 nm were observed in Ag nanodots prepared by pulsed laser deposition. The real [Re chi((3))] and imaginary [Im chi((3))] parts of the third order nonlinearity of these films were measured using the Z-scan technique. At low input irradiances, the decrease in absorption near the focal point results from a negative Im chi((3)) and yields SA. At higher input irradiance, RSA becomes dominant. The transition from SA to RSA suggests that there is a threshold irradiance at which additional nonlinear process(es) is (are) involved and become dominant. The recovery time of these nonlinear processes was measured by a degenerate pump-probe experiment. The effects are explained in terms of the electron dynamics in the excited states. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.2990056]
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