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(a) A schematic of the innovative cloak, which is composed of a hidden area (0 < r′ < a), a circular layer of complementary media of εII, μ II(a < r′ < b), and an internal-cloak-like area of εIII, μ III (b < r′ < c). Here, a, b, and c are 0.5, 1, and 2 units, respectively. (b) The Ez distribution of the cloak with an empty hidden area. There is no perturbation of the Ez distribution indicating that the cloak conceals itself well.
Snapshots of the electric field Ez distributions. (a) The cloak with the hidden area of ε = 2 and μ = 2. The propagating wave presents a circular wave front in the region I and II. (b) The cloak with a lossy object ε = 5 + 0.1i, μ = 1 as a detector in the hidden area. (c) The cloak with a line source (the yellow dot) put nearby the detector demonstrates the identical field distribution in the region I and II compared to the one in (b). (d) The cloak with a 60° incident wave presents the identical field distribution of the region I and II as the cases in (b) and (c).
Snapshots of the electric field Ez distributions. (a) The cloak enables to conceal different shapes, sizes, and constituent parameters of arbitrary multi-objects such as a rectangular metal with ε = −5, μ = 1, and σ = 3 × 108, a triangular lossy material with ε = 10 + 5i, μ = 1, and an elliptical negative index material with ε = −5, and μ = −2. (b) The cloak supports the anti-object to complement the field scattered by the object in the hidden area. (c) For the external cloak, there appears the dramatic scattered field once the positions of the object and the anti-object possess a small rotation offset (0.1° in this case). (d) The cloak can hide objects well even if the positions of the two objects contain a relative 45° rotation offset.
Snapshots of the electric field Ez distributions. (a) The cloak with a rectangular hollowed air hole in the internal-cloak-like area and without any hidden object. (b) The broken internal-cloak-like area with an object of ε = −5 + 5i, μ = 1 and σ = 3 × 108. Compared to (a), the scattered field is identical to the case in (a), which indicates that the cloak with a partially broken outer shell will reveal the cloak itself. However, the hidden object is still invisible. (c) The cloak with a broken complementary area would conceal a hidden object well. Again, the hidden object is still invisible.
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