Transformation of the corner: A shield cloak and a planar retro-reflector

Abstract

A metallic sheet, coated with a few blocks of all-dielectric isotropic materials, is presented for creating an illusion or an image of a corner based on quasi-conformal transformation optics. On the one hand, our design is able to generate cloaking effects to conceal objects hiding inside a corner. On the other hand, we propose to use such a planar transformation device to represent a corner reflector that reflects light directly back to its source. The full wave simulation shows our device is capable of operating considerably well in a broad frequency range, and presents only the appearance of a bare corner functioning as a shield cloak or a planar retro-reflector.

Bi-functional Fresnel zone plate from transformation optics

“…However, the magic of the transformation optics should have a much wider scope of light control. In particular, it offers a useful tool to devise novel devices that can have more advanced functionalities or possess multiple applications, such as becoming invisible, creating illusions, and achieving high-resolution imaging [17][18][19][20][21][22][23][24][25][26][27][28], rather than merely performing the simple duplication.…”