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Optics Express

Optics Express

  • Editor: C. Martijin de Sterke
  • Vol. 19, Iss. 7 — Mar. 28, 2011
  • pp: 6078–6092

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

Jad C. Halimeh, Roman Schmied, and Martin Wegener  »View Author Affiliations

Optics Express, Vol. 19, Issue 7, pp. 6078-6092 (2011)

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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 the numerical work involved in the quasi-conformal carpet cloak, the refractive-index profile of a conformal grating cloak follows a closed and exact analytical form. We have previously mentioned that finite-size conformal grating cloaks may exhibit better cloaking than usual finite-size carpet cloaks. In this paper, we directly visualize their performance using photorealistic ray-tracing simulations. We employ a Newtonian approach that is advantageous compared to conventional ray tracing based on Snell’s law. Furthermore, we quantify the achieved cloaking quality by computing the cross-correlations of rendered images. The cross-correlations for the grating cloak are much closer to 100% (i.e., ideal) than those for the Gaussian carpet cloak.

© 2011 OSA

OCIS Codes
(080.0080) Geometric optics : Geometric optics
(080.2710) Geometric optics : Inhomogeneous optical media
(160.3918) Materials : Metamaterials
(230.3205) Optical devices : Invisibility cloaks

Original Manuscript: December 23, 2010
Revised Manuscript: February 9, 2011
Manuscript Accepted: February 10, 2011
Published: March 17, 2011

Jad C. Halimeh, Roman Schmied, and Martin Wegener, "Newtonian photorealistic ray tracing of grating cloaks and correlation-function-based cloaking-quality assessment," Opt. Express 19, 6078-6092 (2011)

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