Journal
NANO LETTERS
Volume 11, Issue 7, Pages 2825-2828Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl201189z
Keywords
Optical metamaterials; invisibility cloak; transformation optics; nanofabrication
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Funding
- U.S. Army Research Office (MURI) [W911NF-09-1-0539]
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- NSF
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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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