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27 April 2024
 
  » arxiv » 1701.9022

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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 ;
Date 31 Jan 2017
AbstractThe 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.
Source arXiv, 1701.9022
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