Hetero-Optomechanical Crystal Zipper Cavity for Multimode Optomechanics

Multimode optomechanics exhibiting several intriguing phenomena, such as coherent wavelength conversion, optomechanical synchronization, and mechanical entanglements, has garnered considerable research interest for realizing a new generation of information processing devices and exploring macroscopic quantum effect. In this study, we proposed and designed a hetero-optomechanical crystal (OMC) zipper cavity comprising double OMC nanobeams as a versatile platform for multimode optomechanics. Herein, the heterostructure and breathing modes with high mechanical frequency ensured the operation of the zipper cavity at the deep-sideband-resolved regime and the mechanical coherence. Consequently, the mechanical breathing mode at 5.741 GHz and optical odd mode with an intrinsic optical Q factor of 3.93 x 10(5) were experimentally demonstrated with an optomechanical coupling rate g(0) = 0.73 MHz between them, which is comparable to state-of-the-art properties of the reported OMC. In addition, the hetero-zipper cavity structure exhibited adequate degrees of freedom for designing multiple mechanical and optical modes. Thus, the proposed cavity will provide a playground for studying multimode optomechanics in both the classical and quantum regimes.

Automated summary

This study proposes a hetero-optomechanical crystal (OMC) zipper cavity as a versatile platform for multimode optomechanics. By utilizing heterostructure and high-frequency breathing modes, the cavity operates in the deep-sideband-resolved regime and exhibits mechanical coherence. The proposed cavity provides a playground for studying multimode optomechanics in both classical and quantum regimes.