20 November 2013 Asymmetric split-ring resonators: a way toward high-quality metamaterials
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Using millimeter-wave spectroscopy, we study the electromagnetic response of asymmetric split-ring resonators made from superconducting niobium. The asymmetry is introduced by using different arm lengths of the U-shape split-ring design. A small asymmetry allows the excitation of an otherwise dark mode with only a weak coupling to electromagnetic field. The radiation losses are strongly reduced in this geometry. The combination of weak electromagnetic coupling and reduced ohmic losses in a superconductor leads to high quality factors of split-ring resonators. Quality factors of up to 150 in an open design are achieved experimentally.
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Sebastian Engelbrecht, Sebastian Engelbrecht, Florian Kraushofer, Florian Kraushofer, Alexey M. Shuvaev, Alexey M. Shuvaev, Biaobing Jin, Biaobing Jin, Sergei Kuznetsov, Sergei Kuznetsov, Andrei Pimenov, Andrei Pimenov, } "Asymmetric split-ring resonators: a way toward high-quality metamaterials," Optical Engineering 53(3), 031207 (20 November 2013). https://doi.org/10.1117/1.OE.53.3.031207 . Submission:

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