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。
A plate-like circular monolayer molybdenum disulfide（MoS2）nanomechanical oscillator system based on Si/SiO2 substrate is proposed.An all-optical method,which uses a strong pump laser and a weak detection laser effect on the oscillator system at the same time,is proposed to measure mechanical oscillator frequency.The phenomenon of phonon-induced transparency is demonstrated in the system,and the physical interpretation is presented.By measuring the width between two peaks in the probe absorption spectrum,we find that the excitonoscillator coupling strength is proportional to the width and the method can be used to measure the exciton-oscillator coupling strength.Further,an all-optical mass sensing scheme is proposed based on the nanomechanical oscillator system.By measuring the resonance frequency shift in optical spectrum,we can obtain the additional mass deposited on the surface of molybdenum disulfide oscillator directly.The simulation results show that the mass responsivity of the oscillator system is 2.32 Hz/ag.The monolayer molybdenum disulfide nanomechanical oscillator system may have potential applications in quantum sensing and all-optical MoS2-based devices.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2017年第1期278-285,共8页
Acta Optica Sinica
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)
关键词
光学器件
量子光学
二硫化钼
纳米机械振子系统
光学特性
质量传感
optical devices
quantum optics
molybdenum disulfide
nanomechanical oscillator system
optical properties
mass sensing
