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首页> 外文期刊>Journal of Applied Physics >Interaction between a Light Beam and a Gunn Oscillator near the Fundamental Edge of GaAs
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Interaction between a Light Beam and a Gunn Oscillator near the Fundamental Edge of GaAs

机译：GaAs基本边缘附近的光束与Gunn振荡器之间的相互作用

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摘要

We have examined how Gunn domains could modulate the transmission of infrared light. All the phenomena related to the free‐carrier absorption cannot give an appreciable effect due to the relatively low carrier density in the devices (1014–1015 cm-3). Modulation by the linear electro‐optic effect is difficult to achieve experimentally. On the other hand, the high value of the electric field inside moving domains produces a shift of the fundamental edge towards longer wavelengths (Franz‐Keldysh effect). We have performed experiments using a GaAs laser as a light source, and a marked modulation was observed. The maximum value that we have observed is 66% at 9050 Å. The electric field deduced from the Franz theory is of the correct order‐of‐magnitude when compared to the fields inside the domain. Another effect of the illumination is to produce extra carriers in the material. Thus, each time a dipole crosses the perturbed region, the current shows a deformation. If the laser is cooled down, the domains can disappear and this provides a means of changing the frequency of the current oscillations. A frequency ratio of 6 has been obtained. The deformation shows a relatively long decay time typically of the order of 100 nsec. We discuss the marked similarity which exists between the transient changes in conductivity occurring in this experiment and those present when a sample containing a high field domain is subjected to an additional voltage pulse. We have found that the same trap level is involved in both experiments.
机译：我们已经研究了耿氏域如何调节红外光的透射。由于器件中相对较低的载流子密度（1014–1015 cm-3），与自由载流子吸收有关的所有现象都无法产生明显的效果。线性电光效应的调制很难通过实验实现。另一方面，运动域内部的高电场值会导致基波边缘向更长波长的移动（弗朗兹·凯尔迪什效应）。我们已经使用GaAs激光器作为光源进行了实验，并且观察到明显的调制。我们观察到的最大值是9050Å时的66％。与领域内部的电场相比，从弗朗兹理论推导的电场具有正确的量级。照明的另一个效果是在材料中产生额外的载流子。因此，每当偶极子穿过扰动区域时，电流就会出现变形。如果激光器冷却下来，则磁畴会消失，这提供了一种改变电流振荡频率的方法。已获得6的频率比。变形显示相对较长的衰减时间，通常约为100纳秒。我们讨论了在该实验中发生的电导率瞬态变化与包含高场域的样品经受额外的电压脉冲时存在的瞬态变化之间存在的显着相似性。我们发现两个实验涉及相同的陷阱水平。

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  • 来源
    《Journal of Applied Physics》 |1969年第10期|共9页
  • 作者

    Guetin P.;

  • 作者单位

    Laboratoires d'Etudes et de Recherches Générales, R.T.C. La Radiotechnique Compelec, 92, Suresnes, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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