Nonreciprocal terahertz beam steering based on magneto-optic metagratings.,Scientific Reports

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Nonreciprocal terahertz beam steering based on magneto-optic metagratings.
Scientific Reports ( IF 3.8 ) Pub Date : 2019-12-27 , DOI: 10.1038/s41598-019-56789-x
Zhiyu Tan ₁ , Fei Fan _{1,

2} , Xipu Dong ₁ , Jierong Cheng ₁ , Shengjiang Chang _{1,

2}

Affiliation

In this work, an active nonreciprocal THz beam steering has been proposed based on a transversely magnetized metal/InSb metagrating. The nonreciprocal dispersion relation and phase shift characteristics of the metal/InSb waveguide are investigated in details. A metagrating structure with gradient phase shift has been designed based on the metal/InSb waveguide. Under the external magnetic field (EMF), the THz beam can be changed among 0, +1st, and -1st order of the metagrating. Due to the nonreciprocity of the metal/InSb metagrating, the deflection angle can be controlled by changing the positive and negative directions of the EMF, to realize bilateral symmetric scanning from -67.8° to 67.8° with over 70% diffraction efficiency, and this device also exhibits the nonreciprocal one-way transmission as an isolator with the isolation of 13 dB. This low-loss, large deflection degree, nonreciprocal beam scanner has a great potential application in the THz regime.

中文翻译：

基于磁光迁移的不可逆太赫兹光束转向。

在这项工作中，已经提出了基于横向磁化金属/ InSb迁移的主动不可逆太赫兹光束转向。详细研究了金属/ InSb波导的不可逆色散关系和相移特性。基于金属/ InSb波导，设计了一种具有梯度相移的准光栅结构。在外部磁场（EMF）的作用下，太赫兹光束可以在0，+ 1和-1st阶跃之间改变。由于金属/ InSb的非互易性，可以通过改变电动势的正负方向来控制偏转角，实现从-67.8°到67.8°的双向对称扫描，衍射效率超过70％，并且该装置它还具有作为隔离器的不可逆单向传输，隔离度为13 dB。

更新日期：2019-12-27

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