A tabletop setup for ultrafast helicity-dependent and element-specific absorption spectroscopy and scattering in the extreme ultraviolet spectral range.
A tabletop setup for ultrafast helicity-dependent and element-specific absorption spectroscopy and scattering in the extreme ultraviolet spectral range.
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用于极紫外光谱范围内的超快螺旋度相关和元素特定吸收光谱和散射的桌面装置。
DOI：
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发表时间：
2020
影响因子：
1.6
通讯作者：
S. Eisebitt
中科院分区：
文献类型：
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作者：
Kelvin Yao;F. Willems;C. von Korff Schmising;C. Strüber;P. Hessing;B. Pfau;D. Schick;D. Engel;Kathinka Gerlinger;Michael Schneider;S. Eisebitt
超快磁化动力学领域的进一步发展需要实验工具来测量具有元素特异性和飞秒时间分辨率的自旋和电子动力学。我们提出了一种新的实验室装置，用于在极端紫外线(XUV)光谱范围内进行两个互补的光实验。其中一个实验是为偏振相关的瞬变光谱设计的，特别是在3d过渡金属Fe、Co和Ni的3p共振下同时测量磁性圆二色(MCD)。第二台仪器设计用于单色光的共振小角散射实验，使我们能够利用纳米尺度上的空间信息来监测自旋动力学。我们将高次谐波(HHG)源与移相器相结合，获得了偏振可变、能量通量约为(3±1)×1010光子/S/谐波(60 EV)的XUV脉冲。专用参考光谱仪有效地将HHG光谱的强度起伏降低到0.12%RMS以下。我们通过捕获Co薄膜的能量和偏振相关的吸收，以及Co/铂多层膜的磁畴网络中的时间分辨小角散射，展示了该装置的能力。新的实验室设置允许系统地研究具有元素特异性的光诱导自旋和电子动力学，特别是以MCD作为对比机制，具有飞秒时间分辨率和前所未有的信噪比。
Further advances in the field of ultrafast magnetization dynamics require experimental tools to measure the spin and electron dynamics with element-specificity and femtosecond temporal resolution. We present a new laboratory setup for two complementary experiments with light in the extreme ultraviolet (XUV) spectral range. One experiment is designed for polarization-dependent transient spectroscopy, particularly for simultaneous measurements of magnetic circular dichroism (MCD) at the 3p resonances of the 3d transition metals Fe, Co, and Ni. The second instrument is designed for resonant small-angle scattering experiments with monochromatic light allowing us to monitor spin dynamics with spatial information on the nanometer scale. We combine a high harmonic generation (HHG) source with a phase shifter to obtain XUV pulses with variable polarization and a flux of about (3 ± 1) × 1010 photons/s/harmonic at 60 eV at the source. A dedicated reference spectrometer effectively reduces the intensity fluctuations of the HHG spectrum to below 0.12% rms. We demonstrate the capabilities of the setup by capturing the energy- and polarization-dependent absorption of a thin Co film as well as the time-resolved small-angle scattering in a magnetic-domain network of a Co/Pt multilayer. The new laboratory setup allows systematic studies of optically induced spin and electron dynamics with element-specificity, particularly with MCD as the contrast mechanism with femtosecond temporal resolution and an unprecedented signal-to-noise ratio.
影响因子：
38.3
作者：
Kampfrath, T.;Battiato, M.;Muenzenberg, M.
通讯作者：
Muenzenberg, M.
影响因子：
16.6
作者：
通讯作者：
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