Bangju Song, Yuna Song, Shunnong Zhang, KaiLong Jin, Weihua Zhu, Qin Li, Zongzhi Zhang, Xian Lin, Ye Dai, Xiaona Yan,
https://iopscience.iop.org/article/10.7567/1882-0786/ab4d2b/pdf
We report the broadband emission of THz pulse in the metallic patterned ferromagnetic heterostructures CoFeB/Pt based on inverse spin-Hall effect, by illuminating a train of linearly polarized 120 fs-wide laser pulses at 800 nm. The spatial-temporal distribution of charge currents by changing the length of the subwavelength rectangular metal-blocks allows not only effectively controlling the magnitude, but also subtly tuning the center frequency and bandwidth of the emitted THz pulses. Our results will open new avenues for the study of modulated spintronic-based THz emitters.
