Thin low-loss dielectric coatings for free-space cloaking.
We report stereolithographic polymer-based fabrication and experimental operation of a microwave X-band cloaking device. The device is a relatively thin (about one wavelength thick) shell of an air-dielectric composite, in which the dielectric component has negligible loss and dispersion. In a finite band (9.7-10.1 GHz), the shell eliminates the shadow and strongly suppresses scattering from a conducting cylinder of six-wavelength diameter for TE-polarized free-space plane waves. The device does not require an immersion liquid or conducting ground planes for its operation. The dielectric constant of the polymer is low enough (ε=2.45) to suggest that this cloaking technique would be suitable for higher frequency radiation, including visible light.
Center for Metamaterials and Integrated Plasmonics, Duke University, Durham, North Carolina 27708, USA. yaroslav.urzhumov@duke.edu
Yaroslav
Y
Urzhumov
Nathan
N
Landy
Tom
T
Driscoll
Dimitri
D
Basov
David R
DR
Smith