Halimeh Jad C, Wegener Martin
Physics Department and Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München, D-80333 München, Germany.
Opt Express. 2013 Apr 22;21(8):9457-72. doi: 10.1364/OE.21.009457.
Carpet or ground-plane invisibility cloaks hide an object in reflection and inhibit transmission experiments by construction. This concept has significantly reduced the otherwise demanding material requirements and has hence enabled various experimental demonstrations. In contrast, free-space invisibility cloaks should work in both reflection and transmission. The fabrication of omnidirectional three-dimensional free-space cloaks still poses significant challenges. Recently, the idea of the carpet cloak has been carried over to experiments on unidirectional free-space invisibility cloaks that only work perfectly for one particular viewing direction and, depending on the design, also for one linear polarization of light only. Here, by using photorealistic ray tracing, we visualize the performance of four types of such unidirectional cloaks in three dimensions for different viewing directions and different polarizations of light, revealing virtues and limitations of these approaches in an intuitive manner.
地毯式或地平面隐身斗篷通过构造在反射实验中隐藏物体，并抑制透射实验。这一概念显著降低了原本苛刻的材料要求，从而实现了各种实验演示。相比之下，自由空间隐身斗篷应在反射和透射中都能起作用。全向三维自由空间斗篷的制造仍然面临重大挑战。最近，地毯式斗篷的概念已被应用于单向自由空间隐身斗篷的实验中，这种斗篷仅在一个特定的观察方向上能完美工作，并且根据设计，也仅对一种线性偏振光起作用。在这里，通过使用逼真的光线追踪，我们在三维空间中可视化了四种此类单向斗篷在不同观察方向和不同光偏振下的性能，以直观的方式揭示了这些方法的优点和局限性。
