Detection of terahertz radiation from longitudinal optical phonon-plasmon coupling modes in InSb film using an ultrabroadband photoconductive antenna
Detection of terahertz radiation from longitudinal optical phonon-plasmon coupling modes in InSb film using an ultrabroadband photoconductive antenna
复制标题
使用超宽带光电导天线检测 InSb 薄膜中纵向光学声子-等离子体耦合模式的太赫兹辐射
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
Tzuen
中科院分区：
文献类型：
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作者：
P. Gu;M. Tani;K. Sakai;Tzuen
利用超快光电导天线探测器观测了InSb薄膜中纵光学声子-等离子体激元耦合模产生的太赫兹辐射。我们展示了一个响应频率高达7太赫兹的低温生长的GaAs基光电导天线门控与25 fs的激光脉冲。结果表明，耦合模的发射频率只与剩余载流子密度有关，而与激发载流子密度无关。研究还发现，半导体中的LO声子-等离子体激元振荡可以作为一种有效的太赫兹源。
Terahertz radiation from longitudinal optical (LO) phonon–plasmon coupling modes in InSb films is observed using an ultrafast photoconductive antenna detector. We demonstrate a response frequency of up to 7 THz for a low-temperature-grown GaAs-based photoconductive antenna gated with 25 fs laser pulses. It is found that the emission frequencies of the coupling modes are dependent only on the residual carrier density, not on the excitation carrier density. It is also found that the LO phonon–plasmon oscillations in semiconductors can serve as an efficient THz source.