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arXiv · 1310.2983

Revisiting the physics of Fano resonances for nanoparticle oligomers

Ben Hopkins·Alexander N. Poddubny·Andrey E. Miroshnichenko·Yuri S. Kivshar
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Abstract

We present a new and robust approach for interpreting the physics of Fano resonances in planar oligomer structures of both metallic and dielectric nanoparticles. We reveal a key mechanism for Fano resonances by demonstrating that such resonances can be generated purely from the interference of nonorthogonal collective eigenmodes, which are clearly identified based on the coupled-dipole approximation. We prove analytically a general theorem to identify the number of collective eigenmodes that can be excited in ring-type nanoparticle oligomers and further demonstrate that no dark mode excitation is necessary for existence of Fano resonances in symmetric oligomers. As a consequence, we unify the understanding of Fano resonances for both plasmonic and all-dielectric oligomers.

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Ben Hopkins, Alexander N. Poddubny, Andrey E. Miroshnichenko, Yuri S. Kivshar. 2013-10-28. Revisiting the physics of Fano resonances for nanoparticle oligomers. https://doi.org/10.1103/physreva.88.053819

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