Switching from visibility to invisibility via Fano resonances: theory and experiment.

Mikhail V Rybin,Yuri S Kivshar,Dmitry S Filonov,Mikhail F Limonov,Pavel A Belov

doi:10.1038/srep08774

Mikhail V Rybin, Yuri S Kivshar + Show 3 more

Open Access

https://doi.org/10.1038/srep08774

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Abstract

Subwavelength structures demonstrate many unusual optical properties which can be employed for engineering of a new generation of functional metadevices, as well as controlled scattering of light and invisibility cloaking. Here we demonstrate that the suppression of light scattering for any direction of observation can be achieved for a uniform dielectric object with high refractive index, in a sharp contrast to the cloaking with multilayered plasmonic structures suggested previously. Our finding is based on the novel physics of cascades of Fano resonances observed in the Mie scattering from a homogeneous dielectric rod. We observe this effect experimentally at microwaves by employing high temperature-dependent dielectric permittivity of a glass cylinder with heated water. Our results open a new avenue in analyzing the optical response of high-index dielectric nanoparticles and the physics of cloaking.

Highlights

Subwavelength structures demonstrate many unusual optical properties which can be employed for engineering of a new generation of functional metadevices, as well as controlled scattering of light and invisibility cloaking
Our finding is based on the novel physics of cascades of Fano resonances observed in the Mie scattering from a homogeneous dielectric rod
The main idea of our approach is based of the properties of the characteristic lineshape of the Fano resonance[18], and the cloaking effect is based on the novel physics of the resonant Mie scattering from a homogeneous dielectric rod that appears as cascades of Fano resonances with each individual resonance described by the conventional Fano formula[19]

Summary

Introduction

Subwavelength structures demonstrate many unusual optical properties which can be employed for engineering of a new generation of functional metadevices, as well as controlled scattering of light and invisibility cloaking. The main idea of our approach is based of the properties of the characteristic lineshape of the Fano resonance[18], and the cloaking effect is based on the novel physics of the resonant Mie scattering from a homogeneous dielectric rod that appears as cascades of Fano resonances with each individual resonance described by the conventional Fano formula[19]. We demonstrate this www.nature.com/scientificreports novel cloaking effect and its tunability experimentally through a heating-induced change of dielectric permittivity of a glass tube filled with water

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