Department of Physics, Ulsan National Institute of Science and Technology, Ulsan, 44919, Republic of Korea.
Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea.
Sci Rep. 2023 Mar 14;13(1):4233. doi: 10.1038/s41598-023-31427-9.
We present a novel scheme to obtain robust, narrowband, and tunable THz emission using a nano-dimensional overdense plasma target, irradiated by two counter-propagating detuned laser pulses. So far, no narrowband THz sources with a field strength of GV/m-level have been reported from laser-solid interaction (mostly half-or single-cycle THz pulses with only broadband frequency spectrum). From two- and three-dimensional particle-in-cell simulations, we find that the strong plasma current generated by the beat ponderomotive force in the colliding region, produces beat-frequency radiation in the THz range. Here we report intense THz pulses [Formula: see text]THz) with an unprecedentedly high peak field strength of 11.9 GV/m and spectral width [Formula: see text], which leads to a regime of an extremely bright narrowband THz source of TW/cm[Formula: see text], suitable for various ambitious applications.
我们提出了一种新颖的方案，使用纳米级过密等离子体靶，用两束反向传播的失谐激光脉冲辐照，获得稳定、窄带且可调谐的太赫兹发射。迄今为止，从激光与固体相互作用中还没有报道过场强达到 GV/m 级的太赫兹窄带源（大多是半周期或单周期太赫兹脉冲，只有宽带频谱）。通过二维和三维的粒子模拟，我们发现，在碰撞区域由拍频感应压力产生的强等离子体电流，会产生太赫兹波段的拍频辐射。在这里，我们报告了强太赫兹脉冲（[Formula: see text]THz），其峰值场强高达 11.9 GV/m，光谱宽度[Formula: see text]，这导致了一种极其明亮的太赫兹窄带源的新 regime，其功率密度达到 TW/cm[Formula: see text]，适用于各种具有挑战性的应用。
