表面粗糙度对纳米谐振器在热机械和环境噪声下参量放大的影响
Surface roughness influence on parametric amplification of nanoresonators in presence of thermomechanical and environmental noise
摘要：
我们研究了表面粗糙度对纳米谐振器中存在热机械和动量交换噪声的参数放大增益的影响。粗糙度由均方根幅度w、相关长度X和粗糙度指数0<H<1表征。研究发现，由于电容耦合的增加，增益随粗糙度的增加（减小H和/或增大W/ X）而显著增加，当本征品质因数Qin与气体碰撞引起的品质因数Qgas相当或更低时，电容耦合起主导作用.然而，对于Qin>>Qgas，表面粗糙度对增益的影响强烈减弱。
英文摘要：
We investigate the surface roughness influence on the gain from parametric amplification in nanoresonators in presence of thermomechanical and momentum exchange noise. The roughness is characterized by the rms amplitude w, the correlation length X, and the roughness exponent 0<H<1. It is found that the gain strongly increases with increasing roughening (decreasing H and/or increasing ratio w/ X) due to increment of capacitive coupling, which plays dominant role when the intrinsic quality factor Qin is comparable or lower than the quality factor Qgas due to gas collisions. However, for Qin>>Qgas, the influence of surface roughness on the gain strongly diminishes.
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