Abstract
By exploiting recent developments associated with coupled microcavities, we introduce the concept of the -symmetric phonon laser with balanced gain and loss. This is accomplished by introducing gain to one of the microcavities such that it balances the passive loss of the other. In the vicinity of the gain-loss balance, a strong nonlinear relation emerges between the intracavity-photon intensity and the input power. This then leads to a giant enhancement of both optical pressure and mechanical gain, resulting in a highly efficient phonon-lasing action. These results provide a promising approach for manipulating optomechanical systems through -symmetric concepts. Potential applications range from enhancing mechanical cooling to designing phonon-laser amplifiers.
- Received 25 March 2014
DOI:https://doi.org/10.1103/PhysRevLett.113.053604
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