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Hybridization in Three Dimensions: A Novel Route toward Plasmonic Metamolecules.

ABSTRACT: 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 ≈ 390) are produced in the mid-IR as a result of the efficient excitation of collective modes in dimer arrays.

SUBMITTER: Zilio P 

PROVIDER: S-EPMC4593574 | biostudies-literature | 2015 Aug

REPOSITORIES: biostudies-literature

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Hybridization in Three Dimensions: A Novel Route toward Plasmonic Metamolecules.

Zilio Pierfrancesco P   Malerba Mario M   Toma Andrea A   Zaccaria Remo Proietti RP   Jacassi Andrea A   De Angelis Francesco F  

Nano letters 20150730 8

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 fr  ...[more]