Effective mass sensing using optomechanically induced transparency in   microresonator system
  Detecting and weighing the individual nanoparticles is an important approach to study the behavior and properties of single particles. Here we illustrate an effective mass sensing scheme using optomechanical resonator system. Based on the optomechanically induced transparency phenomenon, a Stokes field reference approach is used to sense the mass of the particle on the microresonator. The field intensity of the transmission field will be changed by the effect of the particle which avoids the limits of decay induced spectral width in the resonance shift detection. Exploiting the perturbation method, we theoretically evaluated the dynamical behavior of the system, and achieved the femtogram level mass sensing without the need for high cavity Q-value, and strong coupling strength in the optomechanically system. 
Yong-Pan Gao, Tie-Jun Wang, Cong Cao, Si-Chen Mi, Daquan Yang, Yong   Zhang, Chuan Wang
quant-ph cond-mat.mes-hall physics.optics