Ultrafast nonlinear control of progressively loaded, single plasmonic nanoantennas fabricated using helium ion milling.
作者： Yudong Wang , Martina Abb , Stuart A. Boden , Javier Aizpurua , C. H. de Groot
DOI: 10.1021/NL403316Z
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摘要: We demonstrate milling of partial antenna gaps and narrow conducting bridges with nanometer precision using a helium ion beam microscope. Single particle spectroscopy shows large shifts in the plasmonic mode spectrum milled antennas, associated transition from capacitive to conductive gap loading. A bridge height is found sufficient shift coupling regime, agreement circuit theory. Picosecond pump–probe reveals an enhanced nonlinear response for partially reaching optimum value intermediate height. Our results show that manipulation load can be used increase antennas.
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