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首页> 外文期刊>Nanotechnology >Tunable parametric amplification of a graphene nanomechanical resonator in the nonlinear regime
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Tunable parametric amplification of a graphene nanomechanical resonator in the nonlinear regime

机译：在非线性状态下的石墨烯纳米机械谐振器的可调谐参数放大

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摘要

Parametric amplification is widely used in nanoelectro-mechanical systems to enhance the transduced mechanical signals. Although parametric amplification has been studied in different mechanical resonator systems, the nonlinear dynamics involved receives less attention. Taking advantage of the excellent electrical and mechanical properties of graphene, we demonstrate electrical tunable parametric amplification using a doubly clamped graphene nanomechanical resonator. By applying external microwave pumping with twice the resonant frequency, we investigate parametric amplification in the nonlinear regime. We experimentally show that the extracted coefficient of the nonlinear Duffing force alpha and the nonlinear damping coefficient eta vary as a function of external pumping power, indicating the influence of higher-order nonlinearity beyond the Duffing (similar to x(3)) and van der Pol (similar to x(2)dx/dt) types in our device. Even when the higher-order nonlinearity is involved, parametric amplification still can be achieved in the nonlinear regime. The parametric gain increases and shows a tendency of saturation with increasing external pumping power. Further, the parametric gain can be electrically tuned by the gate voltage with a maximum gain of 10.2 dB achieved at the gate voltage of 19 V. Our results will benefit studies on nonlinear dynamics, especially nonlinear damping in graphene nanomechanical resonators that has been debated in the community over past decade.
机译：参量放大被广泛应用于纳米机电系统中，以增强传输的机械信号。虽然在不同的机械谐振器系统中对参量放大进行了研究，但所涉及的非线性动力学受到的关注较少。利用石墨烯优异的电学和力学性能，我们利用双钳位石墨烯纳米机械谐振器演示了电可调谐参量放大。通过使用两倍谐振频率的外部微波泵浦，我们研究了非线性区域中的参量放大。我们的实验表明，非线性杜芬力α和非线性阻尼系数eta的提取系数随外部泵浦功率的变化而变化，表明在我们的装置中，除了杜芬（类似于x（3））和范德波尔（类似于x（2）dx/dt）类型之外，还存在高阶非线性的影响。即使涉及到高阶非线性，在非线性区域仍然可以实现参量放大。随着外泵浦功率的增加，参量增益增加，并呈现饱和趋势。此外，参数增益可以通过栅极电压进行电调谐，在19 V的栅极电压下获得10.2 dB的最大增益。我们的结果将有助于研究非线性动力学，尤其是石墨烯纳米机械谐振器中的非线性阻尼，这在过去十年中一直是社会上争论的话题。

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  • 来源
    《Nanotechnology》 |2021年第15期|共7页
  • 作者

    Su Zi-Jia; Ying Yue; Song Xiang-Xiang; Zhang Zhuo-Zhi; Zhang Qing-Hang; Cao Gang; Li Hai-Ou; Guo Guang-Can; Guo Guo-Ping;

  • 作者单位

    Univ Sci &

    Technol China CAS Key Lab Quantum Informat Hefei 230026 Anhui Peoples R China;

    Univ Sci &

    Technol China CAS Key Lab Quantum Informat Hefei 230026 Anhui Peoples R China;

    Univ Sci &

    Technol China CAS Key Lab Quantum Informat Hefei 230026 Anhui Peoples R China;

    Univ Sci &

    Technol China CAS Key Lab Quantum Informat Hefei 230026 Anhui Peoples R China;

    Univ Sci &

    Technol China CAS Key Lab Quantum Informat Hefei 230026 Anhui Peoples R China;

    Univ Sci &

    Technol China CAS Key Lab Quantum Informat Hefei 230026 Anhui Peoples R China;

    Univ Sci &

    Technol China CAS Key Lab Quantum Informat Hefei 230026 Anhui Peoples R China;

    Univ Sci &

    Technol China CAS Key Lab Quantum Informat Hefei 230026 Anhui Peoples R China;

    Univ Sci &

    Technol China CAS Key Lab Quantum Informat Hefei 230026 Anhui Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    parametric amplification; nanomechanical resonator; graphene; nonlinear dynamics;

    机译：参量放大;纳米机械谐振器;石墨烯;非线性动力学;

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