Dynamic Wavelength Conversion in Copropagating Slow-Light Pulses
Dynamic Wavelength Conversion in Copropagating Slow-Light Pulses
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DOI：
10.1103/physrevlett.112.223904
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发表时间：
2014-06-06
影响因子：
8.6
通讯作者：
Baba, T.
中科院分区：
文献类型：
--
作者：
Kondo, K.;Baba, T.
动态波长转换（DWC）是通过控制共同传播的慢光信号并控制脉冲轨迹来获得的。我们的方法基于这样的理解：传统的基于谐振器的 DWC 可以推广，并且与交叉相位调制相关。色散工程硅光子晶体波导产生这种慢光脉冲。控制脉冲的双光子吸收产生的自由载流子动态地改变信号波长。匹配两个脉冲的群速度可以增强位移，延长相互作用长度。我们证明了 DWC 中信号波长的极大波长偏移（4.9 nm 蓝移）。尽管 DWC 与多普勒效应相似，但我们强调它们的本质区别。
Dynamic wavelength conversion (DWC) is obtained by controlling copropagating slow-light signal and control pulse trajectories. Our method is based on the understanding that conventional resonator-based DWC can be generalized, and is linked to cross-phase modulation. Dispersion-engineered Si photonic crystal waveguides produce such slow-light pulses. Free carriers generated by two-photon absorption of the control pulse dynamically shift the signal wavelength. Matching the group velocities of the two pulses enhances the shift, elongating the interaction length. We demonstrate an extremely large wavelength shift in DWC (4.9 nm blueshift) for the signal wavelength. Although DWC is similar to the Doppler effect, we highlight their essential differences.