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

作者：Engelbrecht Sebastian^*; Kraushofer Florian; Shuvaev Alexey M; Jin Biaobing; Kuznetsov Sergei A; Pimenov Andrei

来源：Optical Engineering, 2014, 53(3): 031207.

DOI：10.1117/1.OE.53.3.031207

• metamaterials
• millimeter waves
• spectroscopy

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.

• 出版日期2014-3
• 单位南京大学