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首页> 外文期刊>Physical review >Current-driven plasmonic boom instability in three-dimensional gated periodic ballistic nanostructures
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Current-driven plasmonic boom instability in three-dimensional gated periodic ballistic nanostructures

机译：三维门控周期性弹道纳米结构中的电流驱动等离子体激增臂不稳定性

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摘要

An alternative approach of using a distributed transmission line analogy for solving transport equations for ballistic nanostructures is applied for solving the three-dimensional problem of electron transport in gated ballistic nanostructures with periodically changing width. The structures with varying width allow for modulation of the electron drift velocity while keeping the plasma velocity constant. We predict that in such structures biased by a constant current, a periodic modulation of the electron drift velocity due to the varying width results in the instability of the plasma waves if the electron drift velocity to plasma wave velocity ratio changes from below to above unity. The physics of such instability is similar to that of the sonic boom, but, in the periodically modulated structures, this analog of the sonic boom is repeated many times leading to a larger increment of the instability. The constant plasma velocity in the sections of different width leads to resonant excitation of the unstable plasma modes with varying bias current. This effect (that we refer to as the superplasmonic boom condition) results in a strong enhancement of the instability. The predicted instability involves the oscillating dipole charge carried by the plasma waves. The plasmons can be efficiently coupled to the terahertz electromagnetic radiation due to the periodic geometry of the gated structure. Our estimates show that the analyzed instability should enable powerful tunable terahertz electronic sources.
机译：使用分布式传输线类比法求解弹道纳米结构的传输方程的另一种方法是解决具有周期性变化宽度的门控弹道纳米结构中电子传输的三维问题。具有变化宽度的结构允许在保持等离子体速度恒定的同时调节电子漂移速度。我们预测，在这种由恒定电流偏置的结构中，如果电子漂移速度与等离子波速度之比从下到上变化，则由于宽度变化引起的电子漂移速度的周期性调制会导致等离子波的不稳定性。这种不稳定性的物理原理类似于声波悬臂，但是在周期性调制的结构中，这种声波悬臂的类似物被重复了很多次，导致不稳定性的增大。在不同宽度的截面中恒定的等离子体速度会导致不稳定的等离子体模式随偏置电流的变化而发生共振激发。这种效应（我们称其为超等离子激波条件）导致不稳定性的强烈增强。预测的不稳定性涉及等离子体波携带的振荡偶极电荷。由于门控结构的周期性几何形状，等离子体激元可以有效地耦合到太赫兹电磁辐射。我们的估计表明，所分析的不稳定性应该能够提供强大的可调太赫兹电子源。

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  • 来源
    《Physical review》 |2016年第19期|195315.1-195315.8|共8页
  • 作者

    G. R. Aizin; J. Mikalopas; M. Shur;

  • 作者单位

    Kingsborough College, The City University of New York, Brooklyn, New York 11235, USA;

    Kingsborough College, The City University of New York, Brooklyn, New York 11235, USA;

    Rensselaer Polytechnic Institute, Troy, New York 12180, USA;

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