It has been shown that the irradiation of a gas target with nanoclusters by a short (tens of femtoseconds), relativistically intense, circularly polarized laser pulse results in the appearance of magnetic dipoles, which are oriented in the direction of the propagation of the laser pulse and produce a quasi-static regular magnetic field with an amplitude to tenths of the field of the initial laser pulse. At a sufficient concentration of clusters, after the end of the laser pulse, the magnetic moments of the dipoles undergo vibrations and the magnetic field oscillates, which is accompanied by the appearance of a short (few-cycle) secondary terahertz radiation. The condition for the appearance of such a short terahertz pulse is that the cyclotron frequency of an electron on average over the volume of the magnetic field is higher than the inverse lifetime of the cluster.

已经表明，纳米团簇对气体目标的照射是短时间（数十飞秒），相对论强度强的圆偏振激光脉冲，导致出现磁偶极子，该磁偶极子的方向沿激光脉冲的传播方向并产生准静态的规则磁场，其幅度为初始激光脉冲场的十分之一。在足够的簇浓度下，在激光脉冲结束之后，偶极子的磁矩经历振动并且磁场振荡，这伴随着短的（很少周期的）次级太赫兹辐射的出现。