title: A carpet cloak for visible light.
abstract: We report an invisibility carpet cloak device, which is capable of making an object undetectable by visible light. The cloak is designed using quasi conformal mapping and is fabricated in a silicon nitride waveguide on a specially developed nanoporous silicon oxide substrate with a very low refractive index (n<1.25). The spatial index variation is realized by etching holes of various sizes in the nitride layer at deep subwavelength scale creating a local effective medium index. The fabricated device demonstrates wideband invisibility throughout the visible spectrum with low loss. This silicon nitride on low index substrate can also be a general scheme for implementation of transformation optical devices at visible frequencies.
authors: NSF Nanoscale Science and Engineering Center, University of California, Berkeley 3112 Etcheverry Hall, UC Berkeley, California 94720, United States.
authors: Majid
authors: M
authors: Gharghi
authors: Christopher
authors: C
authors: Gladden
authors: Thomas
authors: T
authors: Zentgraf
authors: Yongmin
authors: Y
authors: Liu
authors: Xiaobo
authors: X
authors: Yin
authors: Jason
authors: J
authors: Valentine
authors: Xiang
authors: X
authors: Zhang