Negative refraction based on purely imaginary metamaterials
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By introducing a new mechanism based on purely imaginary metamaterials (PIMs), we reveal that bidirectional negative refraction and planar focusing can be obtained using a pair of PIM slabs, overcoming the unidirectional limit in parity-time (PT)-symmetric systems. Compared with PT-symmetric systems, which require two different types of materials, the proposed negative refraction can be realized using two identical media. In addition, asymmetric excitation with bidirectional total transmission is observed in our PIM system. Therefore, a new way to realize negative refraction with properties that are unavailable in PT-symmetric systems is presented.
Keywordsnegative refraction coherent perfect absorber laser purely imaginary metamaterials
This work was supported by the National Natural Science Foundation of China (Grant No. 11604229), the Natural Science Foundation of Jiangsu Province (Grant No. BK20171206), the Postdoctoral Science Foundation of China (Grant No. 2015M580456), and the Fundamental Research Funds for the Central Universities (Grant No. 20720170015). Y. Xu is grateful for support from the Collaborative Innovation Center of Suzhou Nano Science and Technology at Soochow University.
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