A Novel Highly Sensitive Angular Rate Sensor Employing Anti-Parity-Time Symmetry

The parity-time (PT) -symmetric gyroscope system is able to solve the problem of achieving high sensitivity in a reduced footprint for optical gyroscopes by manipulating the physical properties of the exceptional points (EP). Nevertheless, its system tuning is intricate and hard to read, which hinders its practical implementation. On the contrary, the real frequency splitting and simple tuning of the anti-parity-time(APT)-symmetric gyroscope system represents a viable alternative to the conventional PT-symmetric gyroscope. However, due to the high fabrication process required for virtual coupling, no experiments have been reported. To achieve this goal, we utilize three resonant cavities in series to construct the APT angular rate sensor system, with the assistance of lossy cavity to meet the imaginary coupling requirement. Due to the much more stable nature of resonant cavities compared to waveguides, the system has greater robustne. Simultaneously, we established the cavity photomechanics model and the angular rate sensing model of the APT system, and tested the response of the system under different frequency differences. The experiment findings demonstrate that the mode splitting in this system is 4 times greater than that of the conventional device. Additionally, the transmission spectrum amplitude displays a highly sensitive response to perturbation during the unbroken period, with a 7 times improvement compared to the first-order system. This provides the basis for experimental validation of the pioneering anti-PT gyroscope.