Acoustic diamond resonators with ultra-small mode volumes

Abstract

Quantum acoustodynamics (QAD) is a rapidly developing field of research, offering possibilities to realize and study macroscopic quantum-mechanical systems in a new range of frequencies, and implement transducers and new types of memories for hybrid quantum devices. Here we propose a novel design for a versatile diamond QAD cavity operating at GHz frequencies, exhibiting effective mode volumes of about $10^{-4}{\lambda }^3$. Our phononic crystal waveguide cavity implements a non-resonant analogue of the optical lightning-rod effect to localize the energy of an acoustic mode into a deeply-subwavelength volume. We demonstrate that this confinement can readily enhance the orbit-strain interaction with embedded nitrogen-vacancy (NV) centres towards the high-cooperativity regime, and enable efficient resonant cooling of the acoustic vibrations towards the ground state using a single NV. This architecture can be readily translated towards setup with multiple cavities in one- or two-dimensional phononic crystals, and the underlying non-resonant localization mechanism will pave the way to further enhance optoacoustic coupling in phoxonic crystal cavities.

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Cited by in corpus (4)

• Perspectives on high-frequency nanomechanics, nanoacoustics, and nanophononics
• Diamond optomechanical cavity with a color center for microwave-to-optical quantum interfaces
• Deep sub-wavelength localization of light and sound in dielectric resonators
• Piezoelectrically driven diamond phononic nanocavity by phonon-matching scheme for quantum applications