双折射超材料与弯折线结构在太赫兹波段四分之一波片的比较
Comparison of Birefringent Metamaterials and Meanderline Structure as Quarter-Wave Plates at Terahertz Frequencies
摘要：
利用单层双折射材料制作了四分之一波片。为了比较，适当缩放的双层曲折线结构被制造。在639 GHz的设计频率下，超材料结构实现了99.9%的圆极化，而曲折线实现了99.6%。曲折线显示出更大的工作带宽，从615 - 743 GHz达到99%以上的圆极化，而超材料从626 - 660 GHz达到99%。然而，两者都足够广泛，可以与CW源一起使用，使得超材料由于易于制造而成为更有吸引力的选择。两个样品都是自立式的，对于曲折线结构具有70 μ m的总厚度，而对于超材料仅具有20 μ m的总厚度，突出了超材料结构所表现出的大程度的双折射。
英文摘要：
We have fabricated a quarter-wave plate from a single layer birefringent metamaterial. For comparison, an appropriately scaled double layer meanderline structure was fabricated. At the design frequency of 639 GHz, the metamaterial 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 metamaterial achieves 99% from 626 - 660 GHz. However, both are broad enough for use with CW sources making metamaterials a more attractive choice due to the ease of fabrication. Both samples are free standing with a total thickness of 70um for the meanderline structure and a mere 20um for the metamaterial highlighting the large degree of birefringence exhibited with metamaterial structures.
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