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Indirect transitions of a signal interacting with a moving refractive index front

机译:信号的间接跃迁与移动的折射率前沿相互作用

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The dynamic manipulation of light can be achieved by the interaction of a signal pulse propagating through or reflected from a refractive index front. Both the frequency and the wave vector of the signal are changed in this case, which is generally referred to as an indirect transition. We have developed a theory to describe such transitions in integrated photonic crystal waveguides. Through indirect transitions, the following effects can be envisaged: large frequency shifts and light stopping and order of magnitude pulse compression and broadening without center frequency shift. All effects can be potentially realized with a refractive index modulation as small as 0.001. For the experimental realization, we have used slow light photonic crystal waveguides in silicon. The refractive index front was obtained by free carriers generation with a switching pulse co-propagating with the signal in the same slow light waveguide. The group velocities of the signal and the front could be varied arbitrarily by choosing the right frequencies of the signal and switching pulses. The indirect transition was unambiguously demonstrated by considering two situations: a) the front overtaking the signal and b) the signal overtaking the front. In both cases, a blue shift of the signal frequency was observed. This blue shift can only be explained by the occurrence of the expected indirect transition and not by a direct transition without wave vector variation.
机译:光的动态操纵可以通过传播穿过折射率前沿或从折射率前沿反射的信号脉冲的相互作用来实现。在这种情况下,信号的频率和波矢量都发生变化,这通常称为间接过渡。我们已经开发出一种理论来描述集成光子晶体波导中的此类跃迁。通过间接过渡,可以想到以下效果:大的频移和光停止以及幅度压缩和不加中心频移的脉冲扩展量级。使用低至0.001的折射率调制可以潜在地实现所有效果。为了实现实验,我们在硅中使用了慢速光子晶体波导。通过在同一个慢光波导中通过与信号共同传播的开关脉冲产生自由载流子来获得折射率前沿。通过选择合适的信号频率和开关脉冲,可以任意改变信号和前部的速度。通过考虑以下两种情况明确地证明了间接过渡:a)前沿超前信号; b)信号超前信号。在两种情况下,都观察到信号频率的蓝移。这种蓝移只能通过预期的间接过渡的发生来解释,而不能通过没有波动矢量变化的直接过渡来解释。

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