Asymmetric split-ring resonators: a way toward high-quality metamaterials

Sebastian Engelbrecht; Florian Kraushofer; Alexey M. Shuvaev; Biaobing Jin; Sergei Kuznetsov; Andrei Pimenov

doi:10.1117/1.OE.53.3.031207

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20 November 2013 Asymmetric split-ring resonators: a way toward high-quality metamaterials

Sebastian Engelbrecht, Florian Kraushofer, Alexey M. Shuvaev, Biaobing Jin, Sergei Kuznetsov, Andrei Pimenov

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Optical Engineering, 53(3), 031207 (2013). https://doi.org/10.1117/1.OE.53.3.031207

Abstract

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.

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Sebastian Engelbrecht, Florian Kraushofer, Alexey M. Shuvaev, Biaobing Jin, Sergei Kuznetsov, and 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

Published: 20 November 2013

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