Spectroscopic study of plasma wave resonances of a two-dimensional electron gas in a microcavity at low temperatures
Spectroscopic study of plasma wave resonances of a two-dimensional electron gas in a microcavity at low temperatures
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低温微腔中二维电子气等离子体波共振的光谱研究
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
M. Ortolani
中科院分区：
文献类型：
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作者：
A. Di Gaspare;V. Giliberti;E. Giovine;F. Evangelisti;M. Ortolani
在等离子体波衰减长度远大于腔长的情况下，高电子迁移率晶体管的沟道可以作为等离子体波的谐振微腔。我们在二维电子气(2DEG)晶体管的微沟道吸收功率的0.15-0.4THz范围内进行了光谱研究，其中有源层是由远程掺杂的AlGaAs/InGaAs/AlGaAs量子阱形成的，其中电子迁移率随着温度的降低而增加。由可调谐倍频太赫兹振荡器发射的辐射通过集成透镜-天线光学系统耦合到腔体。测量了作为频率的函数的整流信号，发现在特定辐射频率下冷却到10K时有一个强烈的增长，这表明在由通道形成的微腔中形成了驻留等离子体波。
The channel of a high electron mobility transistor can work as a resonant microcavity for plasma waves, provided that the plasmon decay length is much larger than the cavity length. We have performed a spectroscopic study in the 0.15–0.4 THz range of the power absorbed by the micrometric channel of a two-dimensional electron gas (2DEG) transistor, where the active layer is formed by a remotely doped AlGaAs/InGaAs/AlGaAs quantum well where the electron mobility increases with decreasing temperature. The radiation emitted by a tunable frequency-multiplied THz oscillator was coupled to the cavity by an integrated lens-antenna optical system. The rectified signal is measured as a function of frequency and a strong increase upon cooling to 10 K is found at specific radiation frequencies, indicating the formation of standing plasma waves in the microcavity formed by the channel.