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

Authors

Di Bao, University of London - Queen Mary and Westfield College
Khalid Z. Rajab, University of London - Queen Mary and Westfield College
Yang Hao, University of London - Queen Mary and Westfield CollegeFollow
Efthymios Kallos, University of London - Queen Mary and Westfield College
Wenxuan Tang, University of London - Queen Mary and Westfield College
Christos Argyropoulos, University of Texas at AustinFollow
Yongzhe Piao, University of London - Queen Mary and Westfield College
Shoufeng Yang, University of Southampton

Document Type

Article

Date of this Version

2011

Citation

New Journal of Physics 13 (2011) 103023

Comments

© IOP Publishing Ltd and Deutsche Physikalische Gesellschaft

doi:10.1088/1367-2630/13/10/103023

Abstract

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-k 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.