Zhang Junchi, Donaldson W R, Agrawal Govind P
Opt Lett. 2021 Aug 15;46(16):4053-4056. doi: 10.1364/OL.432180.
We investigate the impact of the finite rise time of a spatiotemporal boundary inside a dispersive medium used for reflection and refraction of optical pulses. We develop a matrix approach in the frequency domain for analyzing such spatiotemporal boundaries and use it to show that the frequency range over which reflection can occur is reduced as the rise time increases. We also show that total internal reflection can occur even for boundaries with long rise times. This feature suggests that spatiotemporal waveguides can be realized through cross-phase modulation even when pump pulses have relatively long rise and fall times.
我们研究了用于光脉冲反射和折射的色散介质内时空边界的有限上升时间的影响。我们在频域中开发了一种矩阵方法来分析这种时空边界，并用它表明随着上升时间增加，能够发生反射的频率范围会减小。我们还表明，即使对于具有长上升时间的边界也会发生全内反射。这一特性表明，即使泵浦脉冲具有相对较长的上升和下降时间，也可以通过交叉相位调制实现时空波导。
