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Grating cloaks are a variation of dielectric carpet (or ground- plane)cloaks. The latter were introduced by Li and Pendry. In contrast to thenumerical work involved in the quasi-conformal carpet cloak, therefractive-index profile of a conformal grating cloak follows a closed andexact analytical form. We have previously mentioned that finite-size conformalgrating cloaks may exhibit better cloaking than usual finite-size carpetcloaks. In this letter, we directly visualize their performance usingphotorealistic ray-tracing simulations. We employ a Newtonian approach that isadvantageous compared to conventional ray tracing based on Snell's law.Furthermore, we quantify the achieved cloaking quality by computing thecross-correlations of rendered images. The cross-correlations for the gratingcloak are much closer to 100% (i.e., ideal) than those for the Gaussian carpetcloak.

Newtonian photorealistic ray tracing of grating cloaks and correlation-function-based cloaking-quality assessment