Stopping of light by the dynamic tuning of photonic crystal slow light device.
Stopping of light by the dynamic tuning of photonic crystal slow light device.
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DOI：
10.1364/oe.18.017141
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发表时间：
2010-08
期刊：
影响因子：
3.8
通讯作者：
Yuji Saito;T. Baba
中科院分区：
文献类型：
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作者：
Yuji Saito;T. Baba
提出了一种简单的基于光子晶体耦合波导（PCCW）的慢光器件阻止光脉冲的技术。动态调谐PCCW中的材料折射率啁啾可以将慢光脉冲动态地转换为停止脉冲。我们证明了这一点，在有限差分时域模拟假设理想和实际调谐的索引啁啾。在理想情况下，几乎停止脉冲的群速度比简单慢光脉冲的群速度小190倍。最小的限制受到波长之间调谐的定时误差的影响。通过优化器件长度和定时，可以重新排序和停止脉冲串。作为一种实用的调谐方法，我们讨论了光激发引起的载流子效应。考虑到载流子分布和自由载流子吸收，估计了实际的停止光的行为。我们定义和评估一个有效的延迟带宽产品，这是自由载流子吸收的影响。
We propose a simple technique of stopping light pulses using a slow-light device based on photonic crystal coupled waveguide (PCCW). Dynamically tuning the material index chirp in the PCCW adiabatically transforms slow-light pulses into stopped ones. We demonstrate this in finite-difference time-domain simulation assuming ideal and actual tuning of the index chirp. In the ideal case, the group velocity of the almost stopped pulse is reduced to 190 times smaller than that of simple slow light pulse. The smallest limit is affected by the timing error of the tuning between wavelengths. Re-ordering and stopping of a pulse train are possible by optimizing the device length and timing. As a practical tuning method, we discuss carrier effects induced by photo-excitation. Taking into account carrier distribution and free carrier absorption, the actual behaviors of stopped light are estimated. We define and evaluate an effective delay-bandwidth product, which is affected by free carrier absorption.