Lin Yanmei, Liu Xiaohe, Chen Huifeng, Guo Xinyi, Pan Jintao, Yu Jianhui, Zheng Huadan, Guan Heyuan, Lu Huihui, Zhong Yongchun, Chen Yaofei, Luo Yunhan, Zhu Wenguo, Chen Zhe
Opt Express. 2019 May 27;27(11):15868-15879. doi: 10.1364/OE.27.015868.
In-plane photonic spin splitting effect is investigated in tunneling terahertz waves through an epsilon-near-zero metamaterial sandwiched between monolayer black phosphorus (BP). The strong in-plane anisotropy of BP layers will induce in-plane asymmetric spin splitting. The asymmetric spin splitting can be flexibly tuned by the angles between the incident plane and the armchair crystalline directions of the top and bottom BP layers, i.e., ϕ and ϕ. Based on this, an angle-resolved barcode-encryption scheme is discussed. For the special case of ϕ = ϕ = 0 or 90°, the transmitted beam undergoes Goos-Hänchen shift, which varies with the carrier density of BP. We believe these findings can facilitate the development of novel optoelectronic devices in the Terahertz region.
通过夹在单层黑磷（BP）之间的近零介电常数超材料对隧穿太赫兹波中的面内光子自旋分裂效应进行了研究。BP层强烈的面内各向异性将诱导出面内不对称自旋分裂。这种不对称自旋分裂可以通过入射平面与顶部和底部BP层扶手椅状晶体方向之间的夹角（即ϕ和ϕ）进行灵活调节。基于此，讨论了一种角度分辨条形码加密方案。对于ϕ = ϕ = 0或90°的特殊情况，透射光束会发生古斯-汉欣位移，该位移随BP的载流子密度而变化。我们相信这些发现能够促进太赫兹区域新型光电器件的发展。
