In the May 2013 e-newsletter from Optics Express, Center publication "Thin low-loss dilectric coatings for free-space cloaking" is listed as the top downloads of May 2013.
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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.
© 2013 Optical Society of America