Institut für Angewandte Physik and DFG-Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Straße 1, D-76131 Karlsruhe, Germany.
Opt Lett. 2011 Jun 1;36(11):2059-61. doi: 10.1364/OL.36.002059.
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 nm down to 500 nm. Cloaking action deteriorates as the woodpile stop band at around 575 nm is approached.
我们将之前介绍的一种偏振无关的三维地毯隐形斗篷中的所有特征缩小了两倍以上。这使得操作波长进入了可见光范围。这些结构通过电子显微镜和光学显微镜进行了表征。与我们之前在红外波长的工作相比，我们可以在可见光频率下直接测量二维图像，从背面进行控制实验，并将图像与理论进行比较。我们发现吻合得非常好。此外，我们还研究了从 900nm 到 500nm 的波长范围内的依赖性。当接近约 575nm 的木堆截止带时，隐形斗篷的效果会恶化。
