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High frequency cavity optomechanics using bulk acoustic phonons

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Journal Article - Open Access

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Yale University New Haven United States

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To date, microscale and nanoscale optomechanical systems have enabled many proof-of-principle quantum operations through access to high-frequency gigahertz phonon modes that are readily cooled to their thermal ground state. However, minuscule amounts of absorbed light produce excessive heating that can jeopardize robust ground-state operation within these microstructures. In contrast, we demonstrate an alternative strategy for accessing high-frequency 13 GHz phonons within macroscopic systems centimeter scale using phase-matched Brillouin interactions between two distinct optical cavity modes. Counterintuitively, we show that these macroscopic systems, with motional masses that are 1 million to 100 million times larger than those of microscale counterparts, offer a complementary path toward robust ground-state operation. We perform both optomechanically induced amplificationtransparency measurements and demonstrate parametric instability of bulk phonon modes. This is an important step toward using these beam splitter and two-mode squeezing interactions within bulk acoustic systems for applications ranging from quantum memories and microwave-to-optical conversion to high-power laser oscillators.

Subject Categories:

  • Solid State Physics
  • Mechanics
  • Crystallography

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