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Title: An omnidirectional retroreflector based on the transmutation of dielectric singularities
Authors: Ma, Y.G. 
Ong, C.K. 
Tyc, T.
Leonhardt, U.
Issue Date: Aug-2009
Citation: Ma, Y.G., Ong, C.K., Tyc, T., Leonhardt, U. (2009-08). An omnidirectional retroreflector based on the transmutation of dielectric singularities. Nature Materials 8 (8) : 639-642. ScholarBank@NUS Repository.
Abstract: Transformation optics1-6 is a concept used in some metamaterials7-11 to guide light on a predetermined path. In this approach, the materials implement coordinate transformations on electromagnetic waves to create the illusion that the waves are propagating through a virtual space. Transforming space by appropriately designed materials makes devices possible that have been deemed impossible. In particular, transformation optics has led to the demonstration of invisibility cloaking for microwaves 12,13, surface plasmons14 and infrared light 15,16. Here, on the basis of transformation optics, we implement a microwave device that would normally require a dielectric singularity, an infinity in the refractive index. To fabricate such a device, we transmute 17 a dielectric singularity in virtual space into a mere topological defect in a real metamaterial. In particular, we demonstrate an omnidirectional retroreflector18,19, a device for faithfully reflecting images and for creating high visibility from all directions. Our method is robust, potentially broadband and could also be applied to visible light using similar techniques. © 2009 Macmillan Publishers Limited. All rights reserved.
Source Title: Nature Materials
ISSN: 14761122
DOI: 10.1038/nmat2489
Appears in Collections:Staff Publications

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