Abstract

We miniaturize all features in a previously introduced polarization-independent three-dimensional carpet invisibility cloak by more than a factor of 2. This leads to operation wavelengths in the visible. The structures are characterized by electron and optical microscopy. In contrast to our previous work at IR wavelengths, we can directly measure two-dimensional images at visible frequencies, perform control experiments from the backside, and compare the images with theory. We find excellent agreement. Furthermore, we study the wavelength dependence in the range from $900\mathrm{nm}$ down to $500\mathrm{nm}$. Cloaking action deteriorates as the woodpile stop band at around $575\mathrm{nm}$ is approached.

© 2011 Optical Society of America

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