亚波长结构中的单周期间隙孤子
Single-cycle gap soliton in a subwavelength structure
摘要：
我们证明了当一个具有几个光周期的脉冲穿过具有亚波长结构的共振二能级稠密介质时，可以产生一个单次周期光脉冲。在不考虑慢变包络和旋转波近似的情况下，观察到了完整Maxwell-Bloch方程中的单周期隙孤子现象。我们的研究表明，亚波长结构可以用来抑制连续介质中脉冲内四波混频引起的频移，并且即使在结构周期打破布拉格条件的情况下，也支持单周期间隙孤子的形成。这表明了一种将高强度激光场缩短到几个甚至单周期脉冲持续时间的方法。
英文摘要：
We demonstrate that a single sub-cycle optical pulse can be generated when a pulse with a few optical cycles penetrates through resonant two-level dense media with a subwavelength structure. The single-cycle gap soliton phenomenon in the full Maxwell-Bloch equations without the frame of slowly varying envelope and rotating wave approximations is observed. Our study shows that the subwavelength structure can be used to suppress the frequency shift caused by intrapulse four-wave mixing in continuous media and supports the formation of single-cycle gap solitons even in the case when the structure period breaks the Bragg condition. This suggests a way toward shortening high-intensity laser fields to few- and even single-cycle pulse durations.
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