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Second-harmonic generation and shielding effects of alkali clusters on ultrathin organic films

机译:碱团簇对超薄有机薄膜的二次谐波产生和屏蔽作用

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摘要

We demonstrate the nonlinear optical activity of large Na and K clusters, grown on Au metal film-supported alkane thiol monolayers of different chain lengths. Both the total optical second-harmonic signal intensity as well as its dependence on the angle of incidence depend on the surface coverage with the alkali metal, thus demonstrating the sensitivity of second-harmonic generation to morphological changes in these complex systems. Simultaneously performed extinction and scanning force microscopy measurements under ambient air conditions allow us to obtain independent information on the surface coverage and cluster morphology. The latter measurements also show that the optical activity of sodium clusters grown on alkane thiols at 150 K and annealed to 300 K is conserved on dosing with oxygen.
机译:我们证明了在不同链长的金金属膜支撑的烷硫醇单分子层上生长的大的Na和K团簇的非线性光学活性。总的二次谐波信号强度及其对入射角的依赖性都取决于碱金属的表面覆盖率,因此证明了二次谐波产生对这些复杂系统中形态变化的敏感性。在环境空气条件下同时进行的消光和扫描力显微镜测量使我们能够获得有关表面覆盖率和团簇形态的独立信息。后面的测量结果还表明,在加氧时,在烷烃硫醇上生长的钠簇在150 K下退火至300 K的光学活性是守恒的。

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