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arXiv · 1701.09022

Switchable invisibility of dielectric resonators

Mikhail V. Rybin·Kirill B. Samusev·Polina V. Kapitanova·Dmitry S. Filonov·Pavel A. Belov·Yuri S. Kivshar·Mikhail F. Limonov
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Abstract

The study of invisibility of an infinite dielectric rod with high refractive index is based on the two-dimensional Mie scattering problem, and it suggests strong suppression of scattering due to the Fano interference between spectrally broad nonresonant waves and narrow Mie-resonant modes. However, when the dielectric rod has a finite extension, it becomes a resonator supporting the Fabry-Perot modes which introduce additional scattering and eventually destroy the invisibility. Here we reveal that for shorter rods with modest values of the aspect ratio r/L (where r and L are the radius and length of the rod, respectively), the lowest spectral window of the scattering suppression recovers completely, so that even a finite-size resonator may become invisible. We present a direct experimental verification of the concept of switchable invisibility at microwaves using a cylindrical finite-size resonator with high refractive index.

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Mikhail V. Rybin, Kirill B. Samusev, Polina V. Kapitanova, Dmitry S. Filonov, Pavel A. Belov, Yuri S. Kivshar, Mikhail F. Limonov. 2017-01-31. Switchable invisibility of dielectric resonators. https://doi.org/10.1103/physrevb.95.165119

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