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arXiv 2302.08407physics.opticscond-mat.mtrl-sciphysics.app-ph
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3D打印太赫兹手征超材料的强宽带纯光学活性

Strong and Broadband Pure Optical Activity in 3D Printed THz Chiral Metamaterials

Ioannis Katsantonis, Maria Manousidaki, Anastasios D. Koulouklidis, Christina Daskalaki, Ioannis Spanos, Constantinos Kerantzopoulos, Anna C. Tasolamprou, Costa… 展开作者

Ioannis Katsantonis, Maria Manousidaki, Anastasios D. Koulouklidis, Christina Daskalaki, Ioannis Spanos, Constantinos Kerantzopoulos, Anna C. Tasolamprou, Costas M. Soukoulis, Eleftherios N. Economou, Stelios Tzortzakis, Maria Farsari, Maria Kafesaki

摘要:

旋光性(光的偏振旋转)是手性介质最期望的特征之一,因为它对于许多偏振相关的应用是重要的。然而,在太赫兹区域,具有强旋光性的手性介质在自然界中是不可用的。在这里,我们从理论上和实验上研究了手性超材料结构组成的对垂直U形谐振器的“扭曲”的武器,我们发现,它表现出大的纯光学活性(即光学活性与可忽略不计的透射波椭圆率)在低太赫兹制度。实验数据表明,偏振旋转高达25(度)的不匹配带宽为1太赫兹(相对带宽80%),从130微米厚度的结构,而理论优化表明,旋转可以达到45(度)。通过等效RLC电路模型分析了该结构的增强手征响应,为增强其手征响应提供了简单的优化规则。所提出的手性结构允许通过直接激光写入和无电镀金属镀容易地制造,使它们成为偏振控制应用的合适候选者。

英文摘要:

Optical activity (polarization rotation of light) is one of the most desired features of chiral media, as it is important for many polarization related applications. However, in the THz region, chiral media with strong optical activity are not available in nature. Here, we study theoretically, and experimentally a chiral metamaterial structure composed of pairs of vertical U-shape resonators of "twisted" arms, and we reveal that it demonstrates large pure optical activity (i.e. optical activity associated with negligible transmitted wave ellipticity) in the low THz regime. The experimental data show polarization rotation up to 25 (deg) for an unmatched bandwidth of 1 THz (relative bandwidth 80 %), from a 130 um-thickness structure, while theoretical optimizations show that the rotation can reach 45 (deg). The enhanced chiral response of the structure is analyzed through an equivalent RLC circuit model, which provides also simple optimization rules for the enhancement of its chiral response. The proposed chiral structures allow easy fabrication via direct laser writing and electroless metal plating, making them suitable candidates for polarization control applications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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