Broadband and high-efficiency transmissive-type nondispersive polarization conversion meta-device
Broadband and high-efficiency transmissive-type nondispersive polarization conversion meta-device
复制标题
宽带高效透射型非色散偏振转换元器件
DOI：
10.1364/ome.8.002430
复制
发表时间：
2018-08-01
影响因子：
2.8
通讯作者：
Zhou, Jiangfeng
中科院分区：
文献类型：
--
作者：
Song, Kun;Su, Zhaoxian;Zhou, Jiangfeng
具有定制电磁性能的超材料在操纵电磁波方面有很大的希望。在这里，我们提出了一种有趣的离谐振亚器件来同时控制电磁波的偏振态和色散特性。所提出的超器件是由两层齿轮状金属图案堆叠而成，由于几何不对称，这些图案表现出明显的各向异性。结果表明，该元器件工作在传输模式下，对垂直入射的线偏振波和圆偏振波均可实现宽频带、无色散的交叉偏振传输，偏振转换率接近100%。此外，无论圆偏振波的入射角度如何，元器件的宽带和有效的偏振转换行为都可以保持。这些令人着迷的性能使超器件成为极好的半波片，极大地有利于偏振操纵。
Metamaterials with tailored electromagnetic properties hold great promise for the manipulation of electromagnetic waves. Here, we propose an intriguing off-resonance meta-device to control the polarization states and dispersive features of the electromagnetic waves simultaneously. The proposed meta-device is composed of stacks of bilayer gear-like metallic patterns, which exhibit significant anisotropy due to the geometric asymmetry. The results show that the considered meta-device operates in a transmission mode and can achieve broadband and nondispersive cross-polarization transmission with a high polarization conversion ratio nearly 100% for both of the normal incident linear and circular polarization waves. Moreover, the broadband and efficient polarization conversion behavior of the meta-device can be maintained regardless of the incident angle for the circular polarization waves. These fascinating performances enable the meta-device to act as an excellent half-wave plate being greatly beneficial for polarization manipulation.