Abstract
Invisibility cloaks designed by optical conformal mapping work only at some discrete frequencies, due to the phase-delay problem. The present work solves the phase-delay problem by using an optical null medium in the lower Riemann sheet. This approach has many advantages, such as a continuous working-frequency band (without geometrical dispersion), omnidirectionality, robustness under frequency shift, and no need for complex materials that are anisotropic and inhomogeneous. The technique offers a realistic means to an omnidirectional conformal cloak.
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