Abstract
Realizing a convenient way to control the phonon laser action is of great importance and may find applications in phonon laser devices engineering. Here we propose a vector parity time (PT)-symmetric optomechanical system to study the phonon laser action. We find that there is a specific region for the optimum mechanical gain appearing in parameter areas of the cavity gain and loss. The intensity of phonon laser action can be well controlled by adjusting the polarization of the pump field. The threshold value of phonon laser action manifests as a function relationship of the polarization direction θ. Furthermore, an ultralow threshold (even if threshold less) can be obtained around the exceptional point with the gain–loss balance. Our results indicate that the intensity and threshold of the phonon laser action can be continuously adjusted by only tuning the photon polarization, which provides a new degree of freedom to realize phonon laser regulation.
Highlights
Realizing a convenient way to control the phonon laser action is of great importance and may find applications in phonon laser devices engineering
Non-Hermitian degeneracies known as exceptional points occuring in open physical systems have recently been utilized to enhance sensitivity in an optical microcavity 39,40, which suggests that the sensitivity enhancement conforms to square-root and cube-root decay law
We propose a feasible scheme to realize a polarization-controlled phonon laser in a vector parity time (PT)-symmetric system based on the mechanical effect of light
Summary
Realizing a convenient way to control the phonon laser action is of great importance and may find applications in phonon laser devices engineering. Our results indicate that the intensity and threshold of the phonon laser action can be continuously adjusted by only tuning the photon polarization, which provides a new degree of freedom to realize phonon laser regulation. In contrast to other conventional phonon lasing regimes[42,43], where the phonon laser action can only be adjusted by the intensity of coherent pump field, the polarized PT-symmetry system proposed here provides a new degree of freedom to realize phonon laser regulation based on the mechanical effect of light. Our regime provides a novel way to improve the performance of controlling a phonon laser, that is achieved by tuning the polarization state of pump light, instead of only regulating the intensity of the pump field[42,43]. We believe that the polarization-related phonon laser action can stimulate further remarkable applications in polarization-controlled on-chip optical architectures due to the improvement of nanofabrication techniques
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