Floquet Phonon Lasing in Multimode Optomechanical Systems

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DOI http://dx.doi.org/10.1103/physrevlett.127.073601
Reference L. Mercadé, K. Pelka, R. Burgwal, A. Xuereb, A. Martínez and E. Verhagen, Floquet Phonon Lasing in Multimode Optomechanical Systems, Phys.Rev.Lett. 127, (7), 073601: 1-7 (2021)
Group Photonic Forces

Dynamical radiation pressure effects in cavity optomechanical systems give rise to self-sustained oscillations or ‘phonon lasing’ behavior, producing stable oscillators up to GHz frequencies in nanoscale devices. Like in photonic lasers, phonon lasing normally occurs in a single mechanical mode. We show here that mode-locked, multimode phonon lasing can be established in a multimode optomechanical system through Floquet dynamics induced by a temporally modulated laser drive. We demonstrate this concept in a suitably engineered silicon photonic nanocavity coupled to multiple GHz-frequency mechanical modes. We find that the long-term frequency stability is significantly improved in the multimode lasing state as a result of the mode locking. These results provide a path toward highly stable ultracompact oscillators, pulsed phonon lasing, coherent waveform synthesis, and emergent many-mode phenomena in oscillator arrays.