Three-Dimensional Invisibility Cloak at Optical Wavelengths

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Science  18 Mar 2010:
DOI: 10.1126/science.1186351


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