Abstract
With the help of optic-null medium, we propose a new way to achieve invisibility by covering up the scattering without using any negative refraction index materials. Compared with previous methods to achieve invisibility, the function of our cloak is to cover up the scattering of the objects to be concealed by a background object of strong scattering. The concealed object can receive information from the outside world without being detected. Numerical simulations verify the performance of our cloak. The proposed method will be a great addition to existing invisibility technology.
Highlights
With the help of optic-null medium, we propose a new way to achieve invisibility by covering up the scattering without using any negative refraction index materials
With the development of new theory (e.g. transformation optics (TO)1–3) and new technologies, many different schemes have been proposed to design invisibility cloaking, some of which have been experimentally demonstrated for some specific frequencies[6,7,8,9,10,11,12,13,14,15]
We found that such an optic-null medium (ONM) can be utilized to achieve the scattering cover-up cloaking without any negative refraction index materials
Summary
With the help of optic-null medium, we propose a new way to achieve invisibility by covering up the scattering without using any negative refraction index materials. Ours can achieve the following simultaneously: Firstly, the concealed object can see the outside world without being seen, secondly, when some parameter (e.g. size, shape, and position) of the concealed objects changes, the cloak still works, and thirdly, there is no need to know or detect any information about the detecting wave in advance. With this method, the concealed object should be set beside a background object with large scattering. We found that such an ONM can be utilized to achieve the scattering cover-up cloaking without any negative refraction index materials
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