All-dielectric invisibility cloaks made of BaTiO3-loaded polyurethane foam

Details All-dielectric invisibility cloaks made of BaTiO3-loaded polyurethane foam All-dielectric invisibility cloaks made of BaTiO3-loaded polyurethane foam

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011njph...13j3023b&link_type=abstract

New Journal of Physics, Volume 13, Issue 10, pp. 103023 (2011).

Physics

Scientific paper

Transformation optics has led the way in the development of electromagnetic invisibility cloaks from science fiction to engineering practice. Invisibility cloaks have been demonstrated over a wide range of the electromagnetic spectrum, and with a variety of different fabrication techniques. However, all previous schemes have relied on the use of metamaterials consisting of arrays of sub-wavelength inclusions. We report on the first cloaking structure made of a high-κ dielectric-loaded foam mixture. A polyurethane foam mixed with different ratios of barium titanate is used to produce the required range of permittivities, and the invisibility cloak is demonstrated to work for all incident angles over a wide range of microwave frequencies. This method will greatly facilitate the development and large-scale manufacture of a wide range of transformation optics-based structures.

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