Journal
ACS PHOTONICS
Volume 2, Issue 10, Pages 1423-1428Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.5b00117
Keywords
substrate-induced bianisotropy; magnetoelectric coupling; multipole expansion; dyadic Green's function
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Funding
- Australian Research Council
- Deutsche Forschungsgemeinschaft (DFG) [CH179/22]
- Russian Foundation for Basic Research [12-02-00528]
- Ministry of Education and Science of the Russian Federation [14.B25.31.0019]
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We study, both numerically and analytically, the effect of a substrate on the optical properties of high-refractive-index dielectric nanoparticles. We demonstrate that the optical response of subwavelength nanoparticles can be effectively modeled in the dipole approximation when the dielectric particle is replaced by a pair of point electric and magnetic dipoles with modified polarizabilities. Based on our model, we reveal the existence of the substrate-induced bianisotropic interaction (magnetoelectric coupling) between electric and magnetic dipole modes, which is strongly enhanced near the corresponding dipole resonances. This results in a specific feature of the radiation pattern that can be employed to identify the effective bianisotropic interaction experimentally.
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