Liu Shaopeng, Liu Bo, Yang Wen-Xing
Opt Express. 2019 Feb 18;27(4):3909-3919. doi: 10.1364/OE.27.003909.
We present a theoretical scheme to realize high-sensitive mass detection in a dispersive optomechanical system (DOMS) via nonlinear sum-sideband. In this scheme, DOMS assisted by a degenerate parametric amplifier (DPA) provides a well-established optomechanical circumstance, where nonlinear optomechanical interaction between cavity mode and mechanical mode of dielectric membrane is expected for creating the frequency components at optical sum-sideband. Such a scheme for mass detection mainly relies on monitoring the conversion efficiency of generated sum-sideband after the added mass is absorbed on the dielectric membrane. Using experimentally achievable parameters, we find that the conversion efficiency of sum-sideband and the sensitivity of mass detection can be simultaneously improved when the nonlinear gain of DPA increases. Furthermore, our results also demonstrate that this mass detection of DOMS can reach femtogram (fg) level resolution, when the method of mass detection relies on a direct relationship between maximum efficiency of sum-sideband and mass-change of membrane.
我们提出了一种理论方案，通过非线性和频边带来实现色散光机械系统（DOMS）中的高灵敏度质量检测。在该方案中，由简并参量放大器（DPA）辅助的DOMS提供了一个成熟的光机械环境，其中预期介电膜的腔模与机械模之间的非线性光机械相互作用会在光学和频边带处产生频率成分。这种质量检测方案主要依赖于监测在介电膜上吸收附加质量后产生的和频边带的转换效率。利用实验可实现的参数，我们发现当DPA的非线性增益增加时，和频边带的转换效率和质量检测的灵敏度可以同时提高。此外，我们的结果还表明，当质量检测方法依赖于和频边带的最大效率与膜的质量变化之间的直接关系时，这种DOMS的质量检测可以达到飞克（fg）级分辨率。
