Nanooptics of molecular-shunted plasmonic nanojunctions.


Type
Article
Change log
Authors
Benz, Felix 
Tserkezis, Christos 
Herrmann, Lars O 
de Nijs, Bart 
Sanders, Alan 
Abstract

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 0.17G(0) per biphenyl-4,4'-dithiol molecule and a total conductance across the plasmonic junction of 30G(0). Our approach provides a reliable tool quantifying the number of molecules in each plasmonic hotspot, here <200.

Description
Keywords
Sensing, molecular conductivity, nanophotonics, plasmonic coupling, plasmonics, surface-enhanced Raman spectroscopy
Journal Title
Nano Lett
Conference Name
Journal ISSN
1530-6984
1530-6992
Volume Title
15
Publisher
American Chemical Society (ACS)
Sponsorship
Engineering and Physical Sciences Research Council (EP/G060649/1)
Engineering and Physical Sciences Research Council (EP/K028510/1)
Engineering and Physical Sciences Research Council (EP/L027151/1)
European Research Council (320503)
Engineering and Physical Sciences Research Council (EP/H007024/1)
We acknowledge financial support from EPSRC grant EP/ G060649/1, EP/I012060/1, EP/L027151/1, EP/K028510/1, ERC grant LINASS 320503. F.B. acknowledges support from the Winton Programme for the Physics of Sustainability. C.T. and J.A. acknowledge financial support from Project FIS2013- 41184-P from MINECO, ETORTEK 2014-15 of the Basque Department of Industry and IT756-13 from the Basque consolidated groups.