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Dipole Approximation to Predict the Resonances of Dimers Composed of Dielectric Resonators for Directional Emission
Author(s) -
Campione Salvatore,
Warne Larry K.,
Basilio Lorena I.
Publication year - 2017
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1002/2017rs006274
Subject(s) - dimer , resonator , dipole , quasistatic approximation , excitation , discrete dipole approximation , dielectric , magnetic dipole , physics , computational physics , molecular physics , atomic physics , materials science , optics , nuclear magnetic resonance , optoelectronics , quantum mechanics
Abstract In this paper we develop a fully retarded, dipole approximation model to estimate the effective polarizabilities of a dimer made of dielectric resonators. They are computed from the polarizabilities of the two resonators composing the dimer. We analyze the situation of full cubes as well as split cubes, which have been shown to exhibit overlapping electric and magnetic resonances. We compare the effective dimer polarizabilities to ones retrieved via full‐wave simulations as well as ones computed via a quasi‐static, dipole approximation. We observe good agreement between the fully retarded solution and the full‐wave results, whereas the quasi‐static approximation is less accurate for the problem at hand. The developed model can be used to predict the electric and magnetic resonances of a dimer under parallel or orthogonal (to the dimer axis) excitation. This is particularly helpful when interested in locating frequencies at which the dimer will emit directional radiation.