加速波包的时间隐身
Temporal cloaking with accelerating wave packets
摘要：
本文从理论上提出了一种基于加速波包的时域隐身方案。单色光波的一部分被赋予了不连续的非线性频率啁啾，因此当不同频率分量在色散存在下传播时，在时空中产生了两个相反的加速焦散。在这个双凸时间间隙内部的光强度可以忽略不计，因此隐藏了封闭的事件。与先前的时间掩蔽方案相比，其中光连续地传播通过具有相反色散的两种不同介质，加速波包在单个色散介质中连续地打开和关闭掩蔽的时间窗口。此外，双凸时间间隙可以被定制成任意形状，并且与它们的菱形对应物相比提供更大的强度抑制。
英文摘要：
We theoretically propose a temporal cloaking scheme based on accelerating wave packets. A part of a monochromatic lightwave is endowed with a discontinuous nonlinear frequency chirp, so that two opposite accelerating caustics are created in space-time as the different frequency components propagate in the presence of dispersion. The light intensity in the interior of this biconvex time gap is negligible, thus concealing the enclosed events. In contrast to previous temporal cloaking schemes, where light propagates successively through two different media with opposite dispersions, accelerating wave packets open and close the cloaked time window continuously in a single dispersive medium. In addition, biconvex time gaps can be tailored into arbitrary shapes and offer a larger suppression of intensity compared to their rhombic counterparts.
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