An ultrathin invisibility skin cloak for visible light. To push back, privacy-focused designers, academics, and activists have designed wearable accessories and clothes meant to thwart facial recognition tech. Here, we demonstrate a cloak operating in. University of Hong Kong - Cited by 119002 - Optics - photonics - materials physics. In contrast to bulky cloaks with volumetric index variation, our device is only 80 nanometer (about one-ninth of the wavelength) thick and potentially scalable for hiding macroscopic objects. The ability to render objects invisible using a cloak - not detectable by an external observer - for concealing objects has been a tantalizing goal1-6. The skin cloak comprises a metasurface with distributed phase shifts rerouting light and rendering the object invisible. This skin cloak conceals a three-dimensional arbitrarily shaped object by complete restoration of the phase of the reflected light at 730-nanometer wavelength. Clear Water Bay, Kowlong, Hong Kong, China 2Institute of Theoretical Physics, Shanghai Jiao Tong University, Shanghai 200240, China 3Institute of Microsystem and Information Technology, CAS, Shanghai 200050, China Abstract: Using the idea of transformation medium, a cloak can be designed to make a domain invisible for one target frequency. Feng, Zhen Wu, Bing-Hong Zhao, Yu-Xi Gao, Jun Qiao, Lu-Feng Yang, Ai-Lin. Here, we demonstrate experimentally an ultrathin invisibility skin cloak wrapped over an object. Two novel classes of spherical invisibility cloaks based on nonlinear. Hence, they are bulky and hard to scale up and, more critically, typical carpet cloaks introduce unnecessary phase shifts in the reflected light, making the cloaks detectable. The University of Hong Kong, or HKU, named Xiang Zhang, Ernest S. Metamaterial-based optical cloaks have thus far used volumetric distribution of the material properties to gradually bend light and thereby obscure the cloaked region.
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