Effect of surface roughness on self-assembled monolayer plasmonic ruler in nonlocal regime

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dc.contributor.authorHajisalem, Ghazal
dc.contributor.authorMin, Qiao
dc.contributor.authorGelfand, Ryan
dc.contributor.authorGordon, Reuven
dc.date.accessioned2016-04-22T21:40:42Z
dc.date.available2016-04-22T21:40:42Z
dc.date.copyright2014en_US
dc.date.issued2014-04-15
dc.description.abstractRecently, self-assembled monolayers (SAMs) have been used for plasmonic rulers to measure the nonlocal influence on the Au nanoparticle - metal film resonance wavelength shift and probe the ultimate field enhancement. Here we examine the influence of surface roughness on this plasmonic ruler in the nonlocal regime by comparing plasmonic resonance shifts for as-deposited and for ultra-flat Au films. It is shown that the resonance shift is larger for ultra-flat films, suggesting that there is not the saturation from nonlocal effects previously reported for the spacer range from 0.7 nm to 1.6 nm. We attribute the previously reported saturation to the planarization of the as-deposited films by thinner SAMs, as measured here by atomic-force microscopy. This work is of interest both in probing the ultimate limits of plasmonic enhancement with SAMs for applications in Raman and nonlinear optics, but also in the study of SAM planarization as a function surface roughness.en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipThis work is funded by an NSERC Strategic Project Grant.en_US
dc.identifier.citationHajisalem, G., Min, Q., Gelfand, R. & Gordon, R. (2014). Effect of surface roughness on self-assembled monolayer plasmonic ruler in nonlocal regime. Optics Express, 22(8), 9604-9610.en_US
dc.identifier.urihttp://dx.doi.org/10.1364/OE.22.009604
dc.identifier.urihttp://hdl.handle.net/1828/7172
dc.language.isoenen_US
dc.publisherOptics Expressen_US
dc.subjectSurface plasmons
dc.subjectPlasmonics
dc.subject.departmentDepartment of Electrical and Computer Engineering
dc.titleEffect of surface roughness on self-assembled monolayer plasmonic ruler in nonlocal regimeen_US
dc.typeArticleen_US

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