分类： 光学 >> 量子光学 提交时间： 2023-02-19
Long Cheng
Huiping Li
Gaoting Lin
Jian Yan
Lei Zhang
Cheng Yang
Wei Tong
Zhuang Ren
Wang Zhu
Xin Cong
Jingjing Gao
Pingheng Tan
Xuan Luo
Yuping sun
Wenguang Zhu
Zhigao Sheng
摘要： Searching multiple types of terahertz (THz) irradiation source is crucial for the THz technology. Here, by utilizing a two-dimensional (2D) ferromagnetic Cr2Ge2Te6 crystal, we firstly demonstrate a magneto-tunable monochromatic THz irradiation source. With a low-photonic-energy broadband THz pump, a strong THz irradiation with frequency ~0.9 THz and bandwidth ~0.25 THz can be generated and its conversion efficiency could even reach 2.1% at 160 K. Moreover, it is intriguing to find that such monochromatic THz irradiation can be efficiently modulated by the magnetic field below 160 K. According to both experimental and theoretical analyses, the emergent THz irradiation is identified as the emission from the phonon-polariton and its temperature and magnetic field dependent behaviors confirmed the large spin-lattice coupling in this 2D ferromagnetic crystal. These observations provide a new route for the creation of tunable monochromatic THz source which may have great practical interests in future applications in photonic and spintronic devices.
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