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research article

Fano Resonant Ring/Disk Plasmonic Nanocavities on Conducting Substrates for Advanced Biosensing

Cetin, Arif E.
•
Altug, Hatice
2012
ACS NANO

By introducing a conducting metal layer underneath a Fang resonant asymmetric ring/disk plasmonic nanocavity system, we demonstrate that electromagnetic fields. can be strongly enhanced. These large electromagnetic fields extending deep into the medium are highly accessible and increase the interaction volume of analytes and optical fields. As a result, we demonstrate high refractive Index sensitivities as large as 648 nm/RIU. By exciting Fano resonances with much sharper spectral features, as narrow as 9 nm, we experimentally show high figure of merits as large as 72 and reliable detection of protein mono- and bilayers. Furthermore, the conducting substrate enables strong interaction between fundamental and higher order modes of the system by minor structural asymmetries. This is very advantageous for experimental realization of systems supporting resonances with well-defined Fano-like line shape without requiring challenging fabrication resolution. Exploiting conducting metallic substrates and the associated propagating surface plasmons at their interface could be extended to other Fano resonant cavity geometries for improved biosensing performance.

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Type
research article
DOI
10.1021/nn303643w
Author(s)
Cetin, Arif E.
•
Altug, Hatice
Date Issued

2012

Published in
ACS NANO
Volume

6

Issue

11

Start page

9989

End page

9995

Subjects

Fano interference

•

figure of merit

•

nanocavities

•

nanofabrication

•

Plasmonics

•

refractive index sensitivity

•

ultrasensitive biosensing

Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
BIOS  
Available on Infoscience
August 16, 2016
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/128623
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