Dispersion management of anisotropic metamirror for super-octave bandwidth polarization conversion

作者：Guo Yinghui; Wang Yanqin; Pu Mingbo; Zhao Zeyu; Wu Xiaoyu; Ma Xiaoliang; Wang Changtao; Yan Lianshan; Luo Xiangang^*

来源：Scientific Reports, 2015, 5(1): 8434.

DOI：10.1038/srep08434

Dispersion engineering of metamaterials is critical yet not fully released in applications where broadband and multispectral responses are desirable. Here we propose a strategy to circumvent the bandwidth limitation of metamaterials by implementing two-dimensional dispersion engineering in the meta-atoms. Lorentzian resonances are exploited as building blocks in both dimensions of the dedicatedly designed meta-atoms to construct the expected dispersion. We validated this strategy by designing and fabricating an anisotropic metamirror, which can accomplish achromatic polarization transformation in 4-octave bandwidth (two times of previous broadband converters). This work not only paves the way for broadband metamaterials design but also inspire potential applications of dispersion management in nano-photonics.

• 出版日期2015-2-13
• 单位西南交通大学; 中国科学院光电技术研究所