High-Q terahertz metamaterial from superconducting niobium nitride films
arXiv:1110.0934 · doi:10.1364/OE.20.000042
Abstract
We present in this letter terahertz (THz) metamaterials with low ohmic losses made from low-temperature superconductor niobium nitride (NbN) films. The resonance properties are characterized by THz time-domain spectroscopy. The unloaded quality factor reaches as high as about 178 at 8 K with the resonance frequency at around 0.58 THz, which is about 24 times as many as gold metamaterials with the same structure. The unloaded quality factor also keeps high as the resonance frequency increases, which is about 90 at 1.02 THz that is close the gap frequency of NbN film. All these experimental observations are well understood in the framework of Bardeen-Cooper-Schrieffer theory and equivalent circuit model. Our work offers an efficient way to design and make high-performance THz electronic devices.
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- Millimeter-Wave Four-Wave Mixing via Kinetic Inductance for Quantum Devices
- Superconducting complementary metasurfaces for THz ultrastrong light-matter coupling
- Intersubband polariton-polariton scattering in a dispersive microcavity
- Wide-Band Tuneability, Nonlinear Transmission, and Dynamic Multistability in SQUID Metamaterials
- Tunable terahertz plasmons in graphite thin films
- Chimera states in networks of locally and non-locally coupled SQUIDs
- A THz time-domain susceptibility for superconductors including strong-current effects