Comparison of birefringent electric split-ring resonator and meanderline structures as quarter-wave plates at terahertz frequencies
- 23 December 2008
- journal article
- research article
- Published by Optica Publishing Group in Optics Express
- Vol. 17 (1), 136-149
- https://doi.org/10.1364/oe.17.000136
Abstract
We have fabricated a quarter-wave plate from a single layer of birefringent electric split-ring resonators (ELC). For comparison, an appropriately scaled double layer meanderline structure was fabricated. At the design frequency of 639 GHz, the ELC structure achieves 99.9% circular polarization while the meanderline achieves 99.6%. The meanderline displays a larger bandwidth of operation, attaining over 99% circular polarization from 615 – 743 GHz, while the ELC achieves 99% from 626 – 660 GHz. However, both are broad enough for use with CW sources making ELCs a more attractive choice due to the ease of fabrication. Both samples are free standing with a total thickness of 70μm for the meanderline structure and a mere 20μm for the ELC highlighting the large degree of birefringence exhibited with metamaterial structures.Keywords
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