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Paper detail

Terahertz Saturable Absorption in Superconducting Metamaterials

We present a superconducting metamaterial saturable absorber at terahertz frequencies. The absorber consists of an array of split ring resonators (SRRs) etched from a 100nm YBaCu3O7 (YBCO) film. A polyimide spacer layer and gold ground plane are deposited above the SRRs, creating a reflecting perfect absorber. Increasing either the temperature or incident electric field (E) decreases the superconducting condensate density and corresponding kinetic inductance of the SRRs. This alters the impedance matching in the metamaterial, reducing the peak absorption. At low electric fields, the absorption was optimized near 80% at T=10K and decreased to 20% at T=70K. For E=40kV/cm and T=10K, the peak absorption was 70% decreasing to 40% at 200kV/cm, corresponding to a modulation of 43%.

preprint2016arXivOpen access
George R. KeiserJingdi ZhangXiaoguang ZhaoXin ZhangRichard D. Averitt
physics.optics
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George R. KeiserJingdi ZhangXiaoguang ZhaoXin ZhangRichard D. Averitt

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