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Carpet or ground-plane invisibility cloaks hide an object in reflection andinhibit transmission by construction. This concept has significantly reducedthe otherwise demanding material requirements and has hence enabled variousexperimental demonstrations. In contrast, free-space invisibility cloaks shouldwork in both reflection and transmission. The fabrication of omnidirectionalthree-dimensional free-space cloaks still poses significant challenges.Recently, the idea of the carpet cloak has been carried over to experiments onunidirectional free-space invisibility cloaks that only work perfectly for oneparticular viewing direction and, depending on the design, also for one linearpolarization of light only. Here, by using photorealistic ray tracing, wevisualize the performance of four types of such unidirectional cloaks in threedimensions for different viewing directions and different polarizations oflight, revealing virtues and limitations of these approaches in an intuitivemanner.

Photorealistic rendering of unidirectional free-space invisibility cloaks