Layered superconductors as negative-refractive-index metamaterials

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Layered superconductors as negative-refractive-index metamaterials

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Title: Layered superconductors as negative-refractive-index metamaterials
Author: Rakhmanov, A. L.; Yampol’skii, V. A.; Fan, Jing; Capasso, Federico; Nori, Franco

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Citation: Rakhmanov, A. L., V. A. Yampol’skii, J. A. Fan, Federico Capasso, and Franco Nori. 2010. Layered superconductors as negative-refractive-index metamaterials. Physical Review B 81 (7): 10.1103.
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Abstract: We analyze the use of layered superconductors as strongly anisotropic metamaterials, which can possess negative-refractive-index in a wide frequency range. Superconductors are of particular interest because they have the potential to support low losses, which is critical for applications such as super-resolution imaging. We show that low-Tc (s-wave) superconductors can be used to construct layered heterostructures with low losses for \(T \ll Tc\). However, the real part of their in-plane effective permittivity is very large, making coupling into the structure difficult. Moreover, even at low temperatures, layered high-Tc superconductors have a large in-plane normal conductivity, producing large losses (due to d-wave symmetry). Therefore, it is difficult to enhance the evanescent modes in either low-Tc or high-Tc superconductors
Published Version: doi:10.1103/PhysRevB.81.075101
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