Tunable mechanical-mode coupling based on nanobeam-double optomechanical cavities

Tunable coupled mechanical resonators with nonequilibrium dynamic phenomena have attracted considerable attention in quantum simulations, quantum computations, and non-Hermitian systems. In this study, we propose tunable mechanical-mode coupling based on nanobeam-double optomechanical cavities. The excited optical mode interacts with both symmetric and antisymmetric mechanical supermodes and mediates coupling at a frequency of approximately 4.96 GHz. The mechanical-mode coupling is tuned through both optical spring and gain effects, and the reduced coupled frequency difference in non-Hermitian parameter space is observed. These results benefit research on the microscopic mechanical parity-time symmetry for topology and on-chip high-sensitivity sensors. (C) 2022 Chinese Laser Press

Automated summary

In this study, tunable mechanical-mode coupling based on nanobeam-double optomechanical cavities is proposed. The coupling of the excited optical mode with both symmetric and antisymmetric mechanical supermodes is mediated at a frequency of approximately 4.96 GHz. The mechanical-mode coupling is tuned through both optical spring and gain effects, and a reduced coupled frequency difference in non-Hermitian parameter space is observed. These results are significant for research on the microscopic mechanical parity-time symmetry for topology and on-chip high-sensitivity sensors.