Open AccessHybridization in Three Dimensions: A Novel Route toward Plasmonic Metamolecules
Author(s) -
Pierfrancesco Zilio,
Mario Malerba,
Andréa Toma,
Remo Proietti Zaccaria,
Andrea Jacassi,
Francesco De Angelis
Publication year - 2015
Publication title -
nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.853
H-Index - 488
eISSN - 1530-6992
pISSN - 1530-6984
DOI - 10.1021/acs.nanolett.5b01437
Subject(s) - plasmon , resonator , nanorod , planar , excitation , q factor , physics , split ring resonator , materials science , optoelectronics , metamaterial , optics , molecular physics , nanotechnology , computer graphics (images) , quantum mechanics , computer science
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.