论文标题
单模光学测量的纳米力学设计策略
Nanomechanical Design Strategy for Single-Mode Optomechanical Measurement
论文作者
论文摘要
机械谐振器的运动本质上是在正常振动模式集合中分解的。当将谐振器用作传感器时，其多模性通常会恶化或限制其性能和灵敏度。在最新的光力传感平台中经常遇到此挑战。我们提出了一种机械设计策略，该策略可确保光机械测量可以检索有关单个机械程度的自由度的信息，并在切成薄片的光子晶体纳米孔谐振器中实施。光谱设计方法用于使机械对称性对抗实践障碍。通过得出连续和脉冲测量应用方案的相关功绩来评估该方法的有效性。该方法可以用于任何机械设计，以提出不必要的伪造机械模式。在Nanobeam平台中，我们通过实验表明，在第一个伪造模式下，通过四个级别的幅度显示了感兴趣模式的信号与噪声比的增加。
The motion of a mechanical resonator is intrinsically decomposed over a collection of normal modes of vibration. When the resonator is used as a sensor, its multimode nature often deteriorates or limits its performance and sensitivity. This challenge is frequently encountered in state-of-the-art optomechanical sensing platforms. We present a mechanical design strategy that ensures that optomechanical measurements can retrieve information on a single mechanical degree of freedom, and implement it in a sliced photonic crystal nanobeam resonator. A spectral design approach is used to make mechanical symmetries robust against practical disorder. The effectiveness of the method is evaluated by deriving a relevant figure of merit for continuous and pulsed measurement application scenarios. The method can be employed in any mechanical design that presents unwanted spurious mechanical modes. In the nanobeam platform, we experimentally show an increase of the signal to noise ratio of the mode of interest over the first spurious mode by four orders of magnitudes.
