Delayed formation of coherent LO phonon-plasmon coupled modes in n- and p-type GaAs measured using a femtosecond coherent control technique
Delayed formation of coherent LO phonon-plasmon coupled modes in n- and p-type GaAs measured using a femtosecond coherent control technique
复制标题
使用飞秒相干控制技术测量 n 型和 p 型 GaAs 中相干 LO 声子-等离子体耦合模式的延迟形成
DOI：
10.1103/physrevb.86.235145
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发表时间：
2011
影响因子：
3.7
通讯作者：
K. Nakamura
中科院分区：
文献类型：
--
作者：
Jianbo Hu;O. Misochko;A. Goto;K. Nakamura
利用一对共线的飞秒激光脉冲进行了相干控制实验，以操纵p型和n型GaAs中的纵光学（LO）声子-等离子体激元耦合（LOPC）模。通过调节脉冲间隔，在两个样品中观察到了明显不同的响应。为了理解所得到的结果，提出了一个考虑延迟形成相干LOPC模式的唯象模型。该模型表明相干LOPC模的寿命起着关键作用，相干LO声子的干涉连续激发两个泵浦脉冲强烈影响相干LOPC模的操作。
Coherent control experiments using a pair of collinear femtosecond laser pulses have been carried out to manipulate longitudinal optical (LO) phonon-plasmon coupled (LOPC) modes in both p- and n-type GaAs. By tuning the interpulse separation, remarkably distinct responses have been observed in the two samples. To understand the results obtained a phenomenological model taking the delayed formation of coherent LOPC modes into account is proposed. The model suggests that the lifetime of coherent LOPC modes plays a key role and the interference of the coherent LO phonons excited successively by two pump pulses strongly affects the manipulation of coherent LOPC modes.