Journal
ACS NANO
Volume 4, Issue 3, Pages 1664-1670Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn901580r
Keywords
plasmonics; optical nanocavities; Fano resonance; subradiance; superradiance
Categories
Funding
- U.S. Army Research Laboratory
- U.S. Army Research Office [W911NF-04-1-0203]
- Robert A. Welch Foundation [C-1222]
- NSF [CNS-0421109]
- Engineering and Physical Sciences Research Council [EP/H000917/2, EP/D063329/1, EP/H000917/1] Funding Source: researchfish
- EPSRC [EP/D063329/1, EP/H000917/2, EP/H000917/1] Funding Source: UKRI
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Subradiant and superradiant plasmon modes in concentric ring/disk nanocavities are experimentally observed. The subradiance is obtained through an overall reduction of the total dipole moment of the hybridized mode due to antisymmetric coupling of the dipole moments of the parent plasmons. Multiple Fano resonances appear within the superradiant continuum when structural symmetry is broken via a nanometric displacement of the disk, due to coupling with higher order ring modes. Both subradiant modes and Fano resonances exhibit substantial reductions in line width compared to the parent plasmon resonances, opening up possibilities in optical and near IR sensing via plasmon line shape design.
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