2010/12/31 by Baile Zhang, Yuan Luo, Xiaogang Liu +1 · 391 citations
Engineering · Materials Science · Physics and Astronomy · #Advanced Antenna and Metasurface Technologies #Cloak #Cloaking #Invisibility #Materials science #Metamaterial #Metamaterials and Metasurfaces Applications #Optics #Physics #Transformation optics #Visible spectrum #physics.optics
paper · pdf · doi:10.1103/physrevlett.106.033901
published in Physical Review Letters 106(3), 033901 (American Physical Society)
openalex publication_date 2011/01/18 · arxiv created 2011/01/23 · arxiv updated 2013/05/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Invisibility cloaks, a subject that usually occurs in science fiction and myths, have attracted wide interest recently because of their possible realization. The biggest challenge to true invisibility is known to be the cloaking of a macroscopic object in the broad range of wavelengths visible to the human eye. Here we experimentally solve this problem by incorporating the principle of transformation optics into a conventional optical lens fabrication with low-cost materials and simple manufacturing techniques. A transparent cloak made of two pieces of calcite is created. This cloak is able to conceal a macroscopic object with a maximum height of 2 mm, larger than 3500 free-space-wavelength, inside a transparent liquid environment. Its working bandwidth encompassing red, green, and blue light is also demonstrated.