Journal
PLASMONICS
Volume 11, Issue 3, Pages 839-849Publisher
SPRINGER
DOI: 10.1007/s11468-015-0117-x
Keywords
Nanoplasmonics; Deep UV; Rh nanoring; Fano resonant mode; Infinity-shaped nanoantenna
Funding
- NSF CAREER [0955013]
- Army Research Laboratory (ARL) Multiscale Multidisciplinary Modeling of Electronic Materials (MSME) Collaborative Research Alliance (CRA) [W911NF-12-2-0023]
- University Graduate School (UGS) at Florida International University
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0955013] Funding Source: National Science Foundation
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Rhodium (Rh) has been recently introduced as a perfect metal for ultraviolet (UV) applications with the advantages of its oxide-free nature and support of strong plasmon resonant modes at very short wavelengths. We report on a simple platform of nanoplasmonic structures to support strong plasmonic Fano resonances across the deep-UV spectrum for biochemical sensing applications. We investigate the plasmonic response of several types of Rh nanoparticles and designed dimer-type antennas using nanorings with geometrical tunability in both symmetric and antisymmetric assemblies. Using numerical and theoretical methods, it is shown that Rh-based dimer antennas with broken symmetry can be tailored to support strong plasmon resonant modes at the deep-UV region (). We also propose a complex infinity-shaped structure composed of a pair of split rings with a nanodisk in between with extra degree of tunability to push the plasmon resonant modes further in deep-UV spectrum. Plasmon hybridization theory is used to describe formation of plasmonic Fano-resonant dips in simple nanoscale assemblies. We calculate the corresponding figure of merit for the Rh-based nanostructure around 11.5 which shows an excellent sensitivity to the refractive index perturbations of the surrounding medium at very short wavelengths for sensing applications.
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