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Anomalous spectral shift of near- and far-field plasmonic resonances in nanogaps

AuthorsLombardi, Anna; Benz, Felix; Aizpurua, Javier ; Baumberg, Jeremy J.
Nanoparticle on mirror
Ultrafast tunable lasers
Issue Date2016
PublisherAmerican Chemical Society
CitationACS Photonics 3(3): 471-477 (2016)
AbstractThe near-field and far-field spectral response of plasmonic systems are often assumed to be identical, due to the lack of methods that can directly compare and correlate both responses under similar environmental conditions. We develop a widely tunable optical technique to probe the near-field resonances within individual plasmonic nanostructures that can be directly compared to the corresponding far-field response. In tightly coupled nanoparticle-on-mirror constructs with nanometer-sized gaps we find >40 meV blue-shifts of the near-field compared to the dark-field scattering peak, which agrees with full electromagnetic simulations. Using a transformation optics approach, we show such shifts arise from the different spectral interference between different gap modes in the near- and far-field. The control and tuning of near-field and far-field responses demonstrated here is of paramount importance in the design of optical nanostructures for field-enhanced spectroscopy, as well as to control near-field activity monitored through the far-field of nano-optical devices.
DescriptionThis is an open access article published under a Creative Commons Attribution (CC-BY) License.-- et al.
Publisher version (URL)http://dx.doi.org/10.1021/acsphotonics.5b00707
Identifiersdoi: 10.1021/acsphotonics.5b00707
e-issn: 2330-4022
Appears in Collections:(CFM) Patentes
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