期刊
NANO LETTERS
卷 11, 期 7, 页码 2825-2828出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl201189z
关键词
Optical metamaterials; invisibility cloak; transformation optics; nanofabrication
类别
资金
- U.S. Army Research Office (MURI) [W911NF-09-1-0539]
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- NSF
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.
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