基于单层二硫化钼纳米机械振子的全光学质量传感

发布时间：2018-07-15 11:52

【摘要】：提出了一种基于硅/二氧化硅基底的平板状圆形单层二硫化钼纳米机械振子系统。通过将一束较强的抽运激光和一束较弱的探测激光同时作用于该振子系统,实现了一种测量机械振子频率的全光学方法,证明了系统中存在声子诱导透明现象,并给出其物理解释。通过测量探测吸收谱中两尖峰之间的分裂宽度,发现激子和振子的耦合强度与线宽呈正比关系,该方法可用来测量激子和振子的耦合强度。基于该纳米机械振子系统,提出了一种全光学质量传感方案。通过测量光谱中的共振频移,可直接得到沉积在二硫化钼振子表面的额外质量。数值结果显示,该振子系统的质量响应率为2.32Hz/ag。单层二硫化钼纳米机械振子系统将在量子传感和基于二硫化钼的全光学器件中得到广泛应用。
[Abstract]:A planar circular monolayer molybdenum disulfide nano mechanical oscillator based on silicon / silicon dioxide substrate is proposed. A full optical method for measuring the frequency of a mechanical oscillator is realized by using a strong pumped laser and a weak probe laser at the same time. It is proved that there is a phonon induced penetration in the system. By measuring the splitting width between the two peaks in the absorption spectrum, it is found that the coupling strength of the exciton and the vibrator is proportional to the line width. This method can be used to measure the coupling strength of the exciton and the vibrator. Based on the nanoscale oscillator system, a full optical mass sensing scheme is proposed. The resonance frequency shift in the measurement spectrum can directly obtain the extra mass deposited on the surface of the molybdenum disulfide oscillator. The numerical results show that the mass response rate of the oscillator system is 2.32Hz/ag. monolayer molybdenum disulfide nano mechanical oscillator system, which will be widely used in quantum sensing and all optical devices based on molybdenum disulfide.
【作者单位】：安徽理工大学力学与光电物理学院;
【基金】：国家自然科学基金(11404005,51502005,61272153,61572035) 安徽高校2013振兴计划青年人才项目(2013SQRL026ZD) 安徽省教育厅重点项目(KJ2012A085)
【分类号】：O431.2

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