Impact of pump wavelength on terahertz emission of a cavity-enhanced spintronic trilayer
Impact of pump wavelength on terahertz emission of a cavity-enhanced spintronic trilayer
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DOI：
10.1063/1.5048297
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发表时间：
2019-01-28
影响因子：
4
通讯作者：
Hendry, E.
中科院分区：
文献类型：
--
作者：
Herapath, R. I.;Hornett, S. M.;Hendry, E.
我们系统地研究了太赫兹脉冲产生在薄膜自旋电子太赫兹发射器的泵浦波长的依赖关系的铁磁CoFeB层之间相邻的SiO2和Pt层。我们发现，太赫兹产生的效率基本上是平坦的150 fs的脉冲与中心波长范围从900到1500 nm的激发，表明自旋电流并不强烈依赖于泵浦光子能量。我们表明，包含的介电覆盖层的TiO 2和SiO 2，设计用于特定的激发波长，可以提高太赫兹发射的一个因素，高达两个领域。(C)2019年作者。
We systematically study the pump-wavelength dependence of terahertz pulse generation in thin-film spintronic THz emitters composed of a ferromagnetic CoFeB layer between adjacent nonmagnetic W and Pt layers. We find that the efficiency of THz generation is essentially flat for excitation by 150 fs pulses with center wavelengths ranging from 900 to 1500 nm, demonstrating that the spin current does not depend strongly on the pump photon energy. We show that the inclusion of dielectric overlayers of TiO2 and SiO2, designed for a particular excitation wavelength, can enhance the terahertz emission by a factor of up to two in field. (C) 2019 Author(s).