Nanooptics of Molecular-Shunted Plasmonic Nanojunctions

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• 作者：Felix Benz ; Christos Tserkezis ; Lars O. Herrmann ; Bart de Nijs ; Alan Sanders ; Daniel O. Sigle ; Laurynas Pukenas ; Stephen D. Evans ; Javier Aizpurua ; Jeremy J. Baumberg
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：January 14, 2015
• 年：2015
• 卷：15
• 期：1
• 页码：669-674
• 全文大小：364K
• ISSN：1530-6992

文摘

Gold nanoparticles are separated above a planar gold film by 1.1 nm thick self-assembled molecular monolayers of different conductivities. Incremental replacement of the nonconductive molecules with a chemically equivalent conductive version differing by only one atom produces a strong 50 nm blue-shift of the coupled plasmon. With modeling this gives a conductance of 0.17G₀ per biphenyl-4,4鈥?dithiol molecule and a total conductance across the plasmonic junction of 30G₀. Our approach provides a reliable tool quantifying the number of molecules in each plasmonic hotspot, here <200.