Switching from visibility to invisibility via Fano resonances: theory and experiment.
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.
1] Ioffe Physical-Technical Institute, St. Petersburg 194021, Russia [2] University ITMO, St. Petersburg 197101, Russia.
Mikhail V
MV
Rybin
University ITMO, St. Petersburg 197101, Russia.
Dmitry S
DS
Filonov
University ITMO, St. Petersburg 197101, Russia.
Pavel A
PA
Belov
1] University ITMO, St. Petersburg 197101, Russia [2] Nonlinear Physics Center, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200, Australia.
Yuri S
YS
Kivshar
1] Ioffe Physical-Technical Institute, St. Petersburg 194021, Russia [2] University ITMO, St. Petersburg 197101, Russia.
Mikhail F
MF
Limonov