Journal
NANO LETTERS
Volume 15, Issue 8, Pages 5200-5207Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b01437
Keywords
3D metamolecule; plasmon hybridization; hollow nanoantenna; electromagnetic field enhancement; 3D split ring; Fano lattice resonance
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Funding
- European Research Council under the European Union's Seventh Framework Programme (FP)/ERC [616213]
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Plasmonic metamolecules have received much interest in the last years because they can produce a wide spectrum of different hybrid optical resonances. Most of the configurations presented so far, however, considered planar resonators lying on a dielectric substrate. This typically yields high damping and radiative losses, which severely limit the performance of the system. Here we show that these limits can be overcome by considering a 3D arrangement made from slanted nanorod dimers extruding from a silver baseplate. This configuration mimics an out-of-plane split ring resonator capable of a strong near-field interaction at the terminations and a strong diffractive coupling with nearby nanostructures. Compared to the corresponding planar counterparts, higher values of electric and magnetic fields are found (about a factor 10 and a factor 3, respectively). High-quality-factor resonances (Q approximate to 390) are produced in the mid-IR as a result of the efficient excitation of collective modes in dimer arrays.
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