Chowdhury Avishek, Clerc Marcel G, Barbay Sylvain, Robert-Philip Isabelle, Braive Remy
Centre de Nanosciences et de Nanotechnologies, CNRS, Université Paris-Saclay, 10 Boulevard Thomas Gobert, Palaiseau, France.
Departamento de Física and Millennium Institute for Research in Optics, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Casilla, 487-3, Santiago, Chile.
Nat Commun. 2020 May 13;11(1):2400. doi: 10.1038/s41467-020-15827-3.
Driven non-linear resonators can display sharp resonances or even multistable behaviours amenable to induce strong enhancements of weak signals. Such enhancements can make use of the phenomenon of vibrational resonance, whereby a weak low-frequency signal applied to a bistable resonator can be amplified by driving the non-linear oscillator with another appropriately-adjusted non-resonant high-frequency field. Here we demonstrate experimentally and theoretically a significant resonant enhancement of a weak signal by use of a vibrational force, yet in a monostable system consisting of a driven nano-electromechanical nonlinear resonator. The oscillator is subjected to a strong quasi-resonant drive and to two additional tones: a weak signal at lower frequency and a non-resonant driving at an intermediate frequency. We analyse this phenomenon in terms of coherent nonlinear resonance manipulation. Our results illustrate a general mechanism which might have applications in the fields of microwave signal amplification or sensing for instance.
受驱动的非线性谐振器可以表现出尖锐的共振，甚至呈现出适合增强微弱信号的多稳态行为。这种增强可以利用振动共振现象，即施加到双稳态谐振器上的微弱低频信号可以通过用另一个适当调整的非共振高频场驱动非线性振荡器来放大。在这里，我们通过实验和理论证明，在由受驱动的纳米机电非线性谐振器组成的单稳态系统中，利用振动力可以显著增强微弱信号。该振荡器受到强烈的准共振驱动以及另外两个音调：较低频率的微弱信号和中间频率的非共振驱动。我们从相干非线性共振操纵的角度分析了这一现象。我们的结果说明了一种可能在例如微波信号放大或传感领域具有应用价值的通用机制。
