旋光
材料科学
超材料
太赫兹辐射
宽带
极化(电化学)
光电子学
谐振器
比旋转
圆极化
光学
物理
化学
物理化学
微带线
作者
Ioannis Katsantonis,Maria Manousidaki,Anastasios D. Koulouklidis,Christina Daskalaki,Ioannis Spanos,Constantinos Kerantzopoulos,Anna C. Tasolamprou,Costas M. Soukoulis,E. N. Economou,S. Tzortzakis,Maria Farsari,Maria Kafesaki
标识
DOI:10.1002/adom.202300238
摘要
Abstract 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, a chiral metamaterial (CMM) structure composed of pairs of vertical U‐shape resonators of “twisted” arms is studied, and it is revealed 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° for an unmatched bandwidth of 1 THz (relative bandwidth 80%), from a 130 µm‐thickness structure, while theoretical optimizations show that the rotation can reach 45°. The enhanced chiral response of the structure is analyzed through an equivalent RLC circuit model, which also provides simple optimization rules for the enhancement of its chiral response. The proposed chiral design allows for easy fabrication via direct laser writing (DLW) and electroless metal plating, making the associated structures suitable candidates for polarization control applications.
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