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Ultrasensitive mass sensing method based on slow light in cavity optomechanics

We present a novel approach using an ultrasensitive mass sensor to evaluate adsorbed mass in cavity optomechanics. The group delay of a transmitted signal field pulse can be adjusted by varying the optomechanical cooperativity, which depends on the effective mass of a mechanical resonator. We derive the linear relationship between the group delay and the adsorbed mass, and define the mass sensitivity of the proposed mass sensor. The results show that the mass sensitivity is determined by the temporal resolution of the evolution of the transmitted signal field pulse. Finally, we demonstrate a mass sensor at the attogram scale for measuring gold nanoparticles.