On-chip high sensitivity rotation sensing based on higher-order exceptional points

A rotation sensing mechanism based on higher-order exceptional points in parity-time-symmetric ternary-coupled microresonators is proposed. Due to the properties of third-order exceptional points, rotation-induced frequency splitting is proportional to the cube root of the rotation rate. Moreover, the sensitivity of the proposed rotation sensing mechanism is improved by at least 1 order of magnitude compared with the parity-time-symmetric binary ring rotation sensing mechanism. This kind of sensing mechanism makes on-chip ultrasensitive rotation sensing possible.