Nanoengineered Spintronic-Metasurface Terahertz Emitters Enable Beam Steering and Full Polarization Control
Nanoengineered Spintronic-Metasurface Terahertz Emitters Enable Beam Steering and Full Polarization Control
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纳米工程自旋电子超表面太赫兹发射器可实现光束转向和完全偏振控制
DOI：
10.1021/acs.nanolett.2c03906
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发表时间：
2022
期刊：
影响因子：
10.8
通讯作者：
Zhensheng Tao
中科院分区：
文献类型：
--
作者：
Shunjia Wang;Wentao Qin;Sheng Zhang;Yuchen Lou;Changqin Liu;Tong Wu;Qiong He;Chuanshan Tian;Lei Zhou;Yizheng Wu;Zhensheng Tao
对太赫兹频率新兴应用的需求推动了用于产生和操纵太赫兹波的新型多功能设备的开发。在这项工作中，我们报告了多功能自旋电子超表面发射器的实现，它允许对宽带太赫兹光束进行同步光束转向和完全偏振控制。这是通过用纳米级磁性异质结构设计单个元原子来实现的，从而实现对激光诱导的自旋和电荷动力学的微观控制。通过在元光栅几何结构中排列自旋电子元原子，生成的太赫兹光束可以在不同衍射级之间的空间中灵活地操纵。此外，我们演示了对不同发射角的太赫兹偏振态的同时控制，并表明两种控制能力是相互独立的。这项工作中展示的纳米工程多功能太赫兹发射器可以为与日益多样化的太赫兹技术应用相关的挑战提供解决方案。
The demand for emerging applications at the terahertz frequencies motivates the development of novel and multifunctional devices for the generation and manipulation of terahertz waves. In this work, we report the realization of multifunctional spintronic-metasurface emitters, which allow simultaneous beam-steering and full polarization control over a broadband terahertz beam. This is achieved through engineering individual meta-atoms with nanoscale magnetic heterostructures and, thus, implementing microscopical control over the laser-induced spin and charge dynamics. By arranging the spintronic meta-atoms in the metagrating geometry, the generated terahertz beam can be flexibly steered in space between different orders of diffraction. Furthermore, we demonstrate a simultaneous control over the terahertz polarization states at different emission angles and show that the two control capabilities are mutually independent of each other. The nanoengineered multifunctional terahertz emitter demonstrated in this work can provide a solution to the challenge associated with a growing variety of applications of terahertz technology.