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Three-Dimensional Invisibility Cloak at Optical Wavelengths

Three-Dimensional Invisibility Cloak at Optical Wavelengths
Author: T. Ergin, N. Stenger, P. Brenner, J.B. Pendry, and M. Wegener links:
Source: Science 328, 337 (2010)
Date: 16.4.2010

Abstract:

We have designed and realized a three-dimensional invisibility-cloaking structure operating at optical wavelengths based on transformation optics. Our blueprint uses a woodpile photonic crystal with a tailored polymer filling fraction to hide a bump in a gold reflector. We fabricated structures and controls by direct laser writing and characterized them by simultaneous high–numerical-aperture, far-field optical microscopy and spectroscopy. A cloaking operation with a large bandwidth of unpolarized light from 1.4 to 2.7 micrometers in wavelength is demonstrated for viewing angles up to 60°.  

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