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Surface-plasmon-enhanced MeV ions from femtosecond laser irradiated, periodically modulated surfaces
2012
Physics of Plasmas
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The third order nonlinear optical properties of two different sized ZnSe and ZnSe/ ZnS quantum dots ͑QDs͒ are investigated. The nonlinear absorption is measured at 806 nm using Ti:sapphire 100 fs laser pulses in an open aperture Z-scan setup. Two-photon absorption ͑2PA͒ is found to be dominant in core and core shell QDs. 2PA cross section is enhanced by three orders of magnitude compared bulk ZnSe. 2PA cross section is observed to increase with reduction in QD diameter, due to strong
doi:10.1063/1.3693388
fatcat:tuvtmiyflzb7dfeuiijvteheie