Observation of phonon trapping in the continuum with topological charges

Abstract

Phonon trapping has an immense impact in many areas of science and technology, from the antennas of interferometric gravitational wave detectors to chip-scale quantum micro- and nano-mechanical oscillators. It usually relies on the mechanical suspension--an approach, while isolating selected vibrational modes, leads to serious drawbacks for interrogation of the trapped phonons, including limited heat capacity and excess noises via measurements. To circumvent these constraints, we realize a new paradigm of phonon trapping using mechanical bound states in the continuum (BICs) with topological features and conducted an in-depth characterization of the mechanical losses both at room and cryogenic temperatures. Our findings of mechanical BICs combining the microwave frequency and macroscopic size unveil a unique platform for realizing mechanical oscillators in both classical and quantum regimes. The paradigm of mechanical BICs might lead to unprecedented sensing modalities for applications such as rare-event searches and the exploration of the foundations of quantum mechanics in unreached parameter spaces.

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• Laser cooling of a nanomechanical oscillator into its quantum ground state
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• Topological nature of bound states in the radiation continuum
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• Mechanical bound states in the continuum for macroscopic optomechanics
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Cited by in corpus (8)

• Observation of miniaturized bound states in the continuum with ultra-high quality factors
• Bound states in the continuum in photonic structures
• Bound States in the Continuum in Compact Acoustic Resonators
• Optomechanical crystal with bound states in the continuum
• Bound modes in the continuum based phononic waveguides
• Merging mechanical bound states in the continuum in high-aspect-ratio phononic crystal gratings
• Deployable Nanoelectromechanical Bound States in the Continuum Enabled by GHz Lamb Wave Phononic Crystals on LiNbO3 Thin Films
• On-chip cavity electro-acoustics using lithium niobate phononic crystal resonators