Abstract
High-sensitivity gyroscope is widely used for rotation detection in several practical applications. Recently, exceptional points (EPs) have garnered considerable attention for enhancing the sensitivity of sensors based on optical cavities. Here, we propose an EP-enhanced optical gyroscope based on mechanical parity-time (PT) symmetry in a microcavity system. We demonstrate that by pumping the two optical modes with different colors, i.e., blue and red detuning, an effective mechanical PT-symmetric system can be obtained, and the system can be prepared at EP with appropriate parameters. The sensitivity of gyroscope at EP was enhanced by more than one order of magnitude in the weak perturbation regime as compared to that at diabolic point. This indicates that the sensitivity of gyroscope can be effectively enhanced by monitoring the mechanical modes rather than the optical modes. Overall, our work provides a promising approach to design high-sensitivity gyroscopes in optical microcavities and is potentially useful in a variety of research fields including fundamental physics and precision measurement.
Highlights
Based on the Sagnac effect[1, 2], a gyroscope with high precision plays an essential role in precision measurement
We propose an exceptional point (EP) enhanced optical gyroscope based on mechanical PT -symmetric system in microcavity
By pumping the two optical modes with different colors, i.e. blue and red detuning, an effective mechanical PT -symmetric system can be obtained and the system can be prepared in EP with appropriate parameters
Summary
Based on the Sagnac effect[1, 2], a gyroscope with high precision plays an essential role in precision measurement. The fact of the narrower effective linewidth of mechanical modes inspires people to enhance the detection resolution by orders of magnitude[60] in optomechanical systems. As a combination of the enhancement performance of EP and the superiority of narrower linewidth possessed by mechanical modes, here we theoretically propose an enhanced gyroscope scheme in effective mechanical PT symmetric system. Compared with conventional schemes utilizing diabolic point, EP enhances the sensitivity of gyroscope with more than 20 times when the rotation frequency keeps below 1 Hz. the results show that the gyroscope can be enhanced effectively by monitoring mechanical response rather than optical modes change.
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