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Kerr-optomechanical spectroscopy of multimode diamond resonators

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posted on 2023-06-22, 16:01 authored by Parisa Behjat, Peyman Parsa, Natalia C. Carvalho, Prasoon K. Shandilya, Paul E. Barclay
Diamond microdisk cavities play a key role in optomechanical and spin-optomechanical technologies. Previous optomechanical studies of these devices have focused exclusively on their fundamental radial breathing mode. Accessing other mechanical modes of these structures is desirable for identifying routes towards improving their optomechanical properties, implementing multimode optomechanical systems, and broadening the accessible range of resonant spin--phonon coupling processes. Here we perform broadband optomechanical spectroscopy on diamond microdisks, and observe high quality factor mechanical modes with frequencies up to 10 GHz. Through Fano interference of their optomechanical response with diamond's Kerr nonlinear optical response, we estimate that optomechanical coupling of these high frequency modes can exceed 10 kHz, making them attractive for high-frequency multimode optomechanics. In combination with their per-phonon stress of a few kPa, these properties makes them excellent candidates for spin-optomechanical coupling.

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