Reliable modulation of terahertz electromagnetic waveforms is important for many applications. Here, we rapidly modulate the direction of the electric field of linearly polarized terahertz electromagnetic pulses with 1–30 THz bandwidth by applying time-dependent magnetic fields to a spintronic terahertz emitter. Polarity modulation of the terahertz field with more than 99% contrast at a rate of 10 kHz is achieved using a harmonic magnetic field. By adding a static magnetic field, we modulate the direction of the terahertz field between angles of, for instance, −53° and 53° at kilohertz rates. We believe our approach makes spintronic terahertz emitters a promising source for low-noise modulation spectroscopy and polarization-sensitive techniques such as ellipsometry at 1–30 THz.

中文翻译：

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以高达 10 kHz 的速率调制来自自旋电子发射器的宽带太赫兹脉冲的极化

太赫兹电磁波形的可靠调制对于许多应用都很重要。在这里，我们通过向自旋电子太赫兹发射器施加与时间相关的磁场，快速调制具有 1-30 THz 带宽的线性极化太赫兹电磁脉冲的电场方向。使用谐波磁场以 10 kHz 的速率对太赫兹场进行极性调制，对比度超过 99%。通过添加静态磁场，我们以千赫兹速率在 -53° 和 53° 之间的角度调制太赫兹场的方向。我们相信我们的方法使自旋电子太赫兹发射器成为低噪声调制光谱和偏振敏感技术（例如 1-30 THz 的椭偏仪）的有希望的来源。