Abstract
Benefiting from the bridgework between cavity optomechanics and optofluidics, microbubble resonators (MBRs) have attracted wide attention both in optomechanics sensing and fundamental research. In this work, we present a novel approach for achieving a fluid mass density sensor based on optomechanics in MBRs. The density responsivity can range from -1.27~-1.54 MHz/(g/ml) for 4 types of mechanical modes. The validation of responsivity is analyzed theoretically, and the calculations indicate that a shorter average radius of the shell can achieve higher responsivity. The density responsivity in a smaller sized and thicker MBR can reach -2.147 MHz/(g/ml). Due to the small volume of the MBRs, the sample consumption can be controlled to dozens of nano-liters, which can greatly reduce the cost of sensing expensive biological samples.
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