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自旋太赫兹源基于铁磁/非磁纳米薄膜异质结构中的超快自旋流-电荷流转换产生太赫兹脉冲, 具有超宽频谱、固态稳定、偏振可调、超薄结构、成本低廉等独特优点, 近年来引起很大的关注. 本文首先简要介绍太赫兹波、太赫兹自旋电子学及自旋太赫兹源; 其次从自旋太赫兹源的性能提升、调控及其应用3方面对其研究进展进行详细的综述, 分别为: 1)基于自旋太赫兹源产生太赫兹的3个过程—超快自旋输运、光学激发、太赫兹出射的性能提升方法, 2)自旋太赫兹源偏振和频谱的主动调控, 3)自旋太赫兹源在太赫兹超宽谱测试、磁结构检测及成像、太赫兹超分辨近场成像等方面的应用; 最后总结全文, 指出自旋太赫兹源目前存在的问题, 并展望其发展方向.Spintronic terahertz (THz) emitter, which is based on ultrafast spin-to-charge current conversion in ferromagnetic/nonmagnetic heterostructures, provides excellent advantages such as ultra-broadband, tunable polarization, and ultra-thin structure, thereby attracting increasing interests recently. In this review article, we first introduce the fundamental concepts of THz wave, THz spintronics and spintronic THz emitter. Next, we focus on the recent progress of spintronic THz emitter by closely looking at the performances, manipulations and applications. Performance improvement is presented based on the three fundamental processes: optical excitation, ultrafast spin transport, and THz emission. The active manipulation of polarization and spectral response, as well as the relevant applications such as ultra broadband measurements, magnetic structure detection and imaging, and THz near-field microscopy, are reviewed comprehensively. Finally, a brief summary and outlook are given.
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Keywords:
- terahertz (THz) /
- spin current /
- ultrafast spin transport /
- magnetic heterostructure
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图 4 金属-介质光子晶体自旋太赫兹源[34] (a)结构示意图; (b)不同周期样品的飞秒激光吸收率与太赫兹强度随介质层SiO2厚度d的变化; (c)归一化的激光吸收率与太赫兹强度
Fig. 4. Metal–dielectric photonic crystal type spintronic THz emitter[34]: (a) Schematic diagram; (b) fs laser absorbance and THz amplitude as the functions of SiO2 thickness d for different repeats; (c) normalized THz amplitude and fs laser absorbance as the functions of SiO2 thickness d for different repeats.
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[1] Tonouchi M 2007 Nat. Photonics 1 97
Google Scholar
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Google Scholar
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[4] Neu J, Schmuttenmaer C A 2018 J. Appl. Phys. 124 231101
Google Scholar
[5] Walowski J, Münzenberg M 2016 J. Appl. Phys. 120 140901
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[6] Kampfrath T, Sell A, Klatt G, Pashkin A, Mährlein S, Dekorsy T, Wolf M, Fiebig M, Leitenstorfer A, Huber R 2010 Nat. Photonics 5 31
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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