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arXiv 2101.04828physics.app-phphysics.optics
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谐振调谐二极管太赫兹振荡器的注入锁定与噪声抑制

Injection Locking and Noise Reduction of Resonant Tunneling Diode Terahertz Oscillator

Tomoki Hiraoka, Takashi Arikawa, Hiroaki Yasuda, Yuta Inose, Norihiko Sekine, Iwao Hosako, Hiroshi Ito, Koichiro Tanaka

摘要:

研究了共振隧穿二极管太赫兹振荡器在小信号注入下的注入锁定特性。由于注入锁定,发射光谱的线宽从自由运行状态下的4.4 MHz急剧减小到小于120 mHz(HWHM)。我们通过实验确定了注入太赫兹波引起的天线注入电压的幅度。锁定范围与注入幅度成正比,与Adler模型一致。随着注入幅度的增加,功率谱中的噪声成分逐渐减少,表现为自由运行状态,而注入锁定成分则交替增加。噪声分量和注入锁定分量在与振荡幅度的$5\times10^{-4}$一样小的阈值注入幅度处具有相同的功率。这种阈值行为可以用马菲佐尼的一般极限环振子的噪声降低模型来定性地解释。

英文摘要:

We studied the injection-locking properties of a resonant-tunneling-diode terahertz oscillator in the small-signal injection regime with a frequency-stabilized continuous THz wave. The linewidth of the emission spectrum dramatically decreased to less than 120 mHz (HWHM) from 4.4 MHz in the free running state as a result of the injection locking. We experimentally determined the amplitude of injection voltage at the antenna caused by the injected THz wave. The locking range was proportional to the injection amplitude and consistent with Adler's model. As increasing the injection amplitude, we observed decrease of the noise component in the power spectrum, which manifests the free-running state, and alternative increase of the injection-locked component. The noise component and the injection-locked component had the same power at the threshold injection amplitude as small as $5\times10^{-4}$ of the oscillation amplitude. This threshold behavior can be qualitatively explained by Maffezzoni's model of noise reduction in general limit-cycle oscillators.

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