Journal
ACS NANO
Volume 5, Issue 8, Pages 6374-6382Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn201529x
Keywords
plasmonics; biosensing; nanofabrication; split-ring resonators; high aspect ratio
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Funding
- Swiss National Science Foundation [20NAN1-123611]
- [200020-119934]
- [200021-125149]
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We present an experimental and theoretical study of plasmonic modes in high aspect ratio nanostructures in the visible wavelength region and demonstrate their high performance for sensing applications. Ordered and well-defined plasmonic structures with various cross-sectional profiles and heights are obtained using a-top-down fabrication process. We show that, compared to cylindrical nanorods, structures with split-ring resonator-like cross sections have. great potential for powerful sensing due to a pronounced polarization dependence, strong field enhancement, structural tunability, and Improved mechanical stability. The plasmonic structures under study exhibit high sensitivities, up to nearly 600 nm/RIU, and figures of merit above 20.
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