A Third Way to Cloak an Object: Cover-up with a Background Object

作者：Sun, Fei; He, Sailing^*

来源：Progress in Electromagnetics Research-PIER, 2014, 149: 173-182.

DOI：10.2528/PIER14100303

• ELECTROMAGNETIC CLOAK
• BROAD-BAND

Based on a space folding transformation, we propose a new way to hide an object in full space, namely, to cover-up the scattering of the hidden object with the scattering of a background object so that only the scattering of the background object can be detected by an outside observer and the hidden object disappears electromagnetically (a very weak "ghost image" or perturbation may appear inside the strong background object image in an experiment). The present method is essentially different from previous methods of cloaking an object, namely, the optically isolated cloak and the scattering cancellation cloak, and thus provide a third way to cloak an object. Unlike all the previous methods of cloaking, the present full-space omni-directional invisibility simultaneously has the following features: (i) the hidden object can "see" the outside world without being detected; (H) the cloak can still work when some characteristics (e.g., shape and medium) of the hidden object change; and (Hi) there is no need to know the information of the incident wave in advance. The present work furthers efforts to achieve invisibility and conceal an object in a real environment in full space.

• 出版日期2014
• 单位浙江大学