Ultrafast Frequency-Shift Dynamics at Temporal Boundary Induced by Structural-Dispersion Switching of Waveguides
Ultrafast Frequency-Shift Dynamics at Temporal Boundary Induced by Structural-Dispersion Switching of Waveguides
复制标题
波导结构色散切换引起的时间边界超快频移动态
DOI：
10.1103/physrevlett.127.053902
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发表时间：
2021
影响因子：
8.6
通讯作者：
Dani Keshav M.
中科院分区：
文献类型：
--
作者：
Miyamaru Fumiaki;Mizuo Chihiro;Nakanishi Toshihiro;Nakata Yosuke;Hasebe Kakeru;Nagase Shintaro;Matsubara Yu;Goto Yusuke;P?rez-Urquizo Joel;Mad?o Julien;Dani Keshav M.
我们通过实验证明了在太赫兹（THz）区域的时间边界处的频移动力学的观察依赖于控制金属-半导体波导的结构色散的方案。超快结构色散开关是通过在波导中传播太赫兹脉冲期间用光泵浦脉冲照射波导表面来实现的。由于相对较高的转换效率，高达23%，在频移充分大于入射脉冲的带宽的条件下，THz频率的快速变化的时间边界附近的直接观察到在时域中。
We experimentally demonstrate the observation of a frequency-shift dynamics at a temporal boundary in the terahertz (THz) region relying on a scheme that controls the structural dispersion of a metal-semiconductor waveguide. Ultrafast structural-dispersion switching is achieved within a subpicosecond timescale by illuminating a waveguide surface with an optical pump pulse during the propagation of a THz pulse in the waveguide. Owing to the relatively high conversion efficiency, up to 23%, under the condition that the frequency shift is sufficiently larger than the bandwidth of the incident pulse, the rapid variation of the THz frequency around the temporal boundary is directly observed in the time domain.