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Room-temperature anisotropic plasma mirror and polarization-controlled optical switch based on type-II Weyl semimetal WP2
Physical Review Applied ( IF 4.532 ) Pub Date : 
Kaixuan Zhang, Yongping Du, Zeming Qi, Bin Cheng, Xiaodong Fan, Laiming Wei, Lin Li, Dongli Wang, Guolin Yu, Shuhong Hu, Changhong Sun, Zhiming Huang, Junhao Chu, Xiangang Wan, and Changgan Zeng

Anisotropy in electronic structures may ignite intriguing anisotropic optical responses, as well demonstrated in various systems including superconductors, semiconductors and even topological Weyl semimetals. Meanwhile, it is well established in metal optics that the metal reflectance declines from one to zero when the photon frequency is above the plasma frequency ωp, behaving as a plasma mirror. However, the exploration of anisotropic plasma mirrors and corresponding applications remains elusive, especially at room temperature. Here, we discover a pronounced anisotropic plasma reflectance edge in the type-II Weyl semimetal WP2, with an anisotropy ratio of ωp up to 1.5. Such anisotropic plasma mirror behavior and its robustness against temperature promise optical device applications over a wide temperature range. For example, the high sensitivity of polarization-resolved plasma reflectance edge renders WP2 an inherent polarization detector. We further achieve a room-temperature WP2-based optical switch, effectively controlled by simply tuning the light polarization. These findings extend the frontiers of metal optics as a discipline and promise the design of multifunctional devices combining both topological and optical features.
更新日期:2020-01-13

 

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