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We report an experimental demonstration of a coupled-mode heat engine in atwo-membrane-in-the-middle cavity optomechanical system. The normal mode of thecavity-mediated strongly coupled nanoresonators is utilized as the workingmedium and an Otto cycle is realized by extracting work between two phononicthermal reservoirs. The heat engine performance is characterized in both normalmode and bare mode pictures, which reveals that the correlation of twomembranes plays a significant role during the thermodynamic cycle. Moreover, astraight-twin nanomechanical engine is implemented by engineering the normalmodes and operating two cylinders out-of-phase. Our results demonstrate anessential class of heat engine for the first time in cavity optomechanicalsystems and provide a novel platform for investigating heat engines ofinteracting subsystems in small scales with controllability and scalability.

Realization of a coupled-mode heat engine with cavity-mediated nanoresonators