期刊
PHYSICAL REVIEW B
卷 81, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.075101
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资金
- National Security Agency (NSA)
- Laboratory of Physical Sciences (LPS)
- Army Research Office (ARO)
- National Science Foundation (NSF) [EIA-0726909, JSPS-RFBR09-02-92114]
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-T-c (s-wave) superconductors can be used to construct layered heterostructures with low losses for T << T-c. 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-T-c 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-T-c or high-T-c superconductors.
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