Abstract
Realization of a perfect invisibility cloak still challenges the current fabricating technologies. Most experiments, if not all, are hence focused on carpet cloaks because of their relatively low requirements to material properties. Nevertheless, present invisibility carpets are used to hide beneath objects. Here, we report a carpet-like device to directionally conceal objects and further to create illusions above it. The device is fabricated through recording a reflection hologram of objects and is used to produce a time-reversed signal to compensate for the information of the objects and further to create light field of another object so as to realize both functions of hiding the objects and creating illusions, respectively. The carpet-like device can work for macroscopic objects at visible wavelength as the distance between objects and device is at decimeter scale. Our carpet-like device to realizing invisibility and creating illusions may provide a robust way for crucial applications of magic camouflaging and anti-detection etc.
Highlights
Realization of a perfect invisibility cloak still challenges the current fabricating technologies
The device is fabricated through recording a reflection hologram of objects and is used to produce a time-reversed signal to compensate for the information of the objects and further to create light field of another object so as to realize both functions of hiding the objects and creating illusions, respectively
Perfect invisibility cloaks require the constitutive materials with extreme properties such as anisotropy, inhomogeneity, singular dielectric parameters, or even negative index of refraction, which challenge the current fabricating technologies[14,15], in optical frequencies
Summary
Realization of a perfect invisibility cloak still challenges the current fabricating technologies. As a result, when an object is placed beneath the curve surface of the carpet cloaks, it is unperceivable to the outside through reflection light[18] Due to their relatively low requirements to material properties, different configurations of the carpet cloaks with 2D19–21 and three-dimensional (3D)[22,23] structures by using manmade metal-contained metamaterials[19] or metal-free all-dielectrics[20,21,22,23] and even naturally available anisotropic materials[24,25] are constructed with working frequency ranging from microwave frequencies[19] to Terahertz, nearinfrared and even visible[23,24,25]. We believe these carpet-like devices to realizing invisibility and illusions should be more applicable in the fields such as magic camouflaging and anti-detection etc
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