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Optical Engineering

Asymmetric split-ring resonators: a way toward high-quality metamaterials
Author(s): Sebastian Engelbrecht; Florian Kraushofer; Alexey M. Shuvaev; Biaobing Jin; Sergei Kuznetsov; Andrei Pimenov
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Paper 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.

Paper Details

Date Published: 20 November 2013
PDF: 5 pages
Opt. Eng. 53(3) 031207 doi: 10.1117/1.OE.53.3.031207
Published in: Optical Engineering Volume 53, Issue 3
Show Author Affiliations
Sebastian Engelbrecht, Technische Univ. Wien (Austria)
Florian Kraushofer, Technische Univ. Wien (Austria)
Alexey M. Shuvaev, Technische Univ. Wien (Austria)
Biaobing Jin, Nanjing Univ. (China)
Sergei Kuznetsov, Novosibirsk State Univ. (Russian Federation)
Andrei Pimenov, Technische Univ. Wien (Austria)

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