Quantum mechanical effects in plasmonic structures with subnanometre gaps
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Metallic structures with nanogap features have proven highly effective as building blocks for plasmonic systems, as they can provide a wide tuning range of operating frequencies and large near-field enhancements. Recent work has shown that quantum mechanical effects such as electron tunnelling and nonlocal screening become important as the gap distances approach the subnanometre length-scale. Such quantum effects challenge the classical picture of nanogap plasmons and have stimulated a number of theoretical and experimental studies. This review outlines the findings of many groups into quantum mechanical effects in nanogap plasmons, and discusses outstanding challenges and future directions.
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Zhu, Wenqi, Esteban, Ruben, Borisov, Andrei G., et al.. "Quantum mechanical effects in plasmonic structures with subnanometre gaps." Nature Communications, 7, (2016) Springer Nature: http://dx.doi.org/10.1038/ncomms11495.