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- Title
Rhodium Plasmonics for Deep-Ultraviolet Bio-Chemical Sensing.
- Authors
Ahmadivand, Arash; Sinha, Raju; Kaya, Serkan; Pala, Nezih
- Abstract
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 ( $$ E>6\; eV $$). 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.
- Subjects
RHODIUM; OPTICAL antennas; PLASMONICS; ULTRAVIOLET spectra; ELECTRIC properties of nanostructured materials; SURFACE plasmon resonance
- Publication
Plasmonics, 2016, Vol 11, Issue 3, p839
- ISSN
1557-1955
- Publication type
Article
- DOI
10.1007/s11468-015-0117-x