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Area of Science:

  • Acoustic Sensing
  • Optomechanics
  • Nanotechnology

Background:

  • Ultrasound sensors are crucial for various scientific and technological fields.
  • Miniaturization and higher spatial resolution demand improved sensor sensitivity.
  • Existing optical resonance sensors have limitations in sensitivity.

Purpose of the Study:

  • To introduce a novel cavity optomechanical ultrasound sensing technique.
  • To enhance ultrasound signal detection through dual optical and mechanical resonances.
  • To develop a microscale silicon-chip-based sensor with superior performance.

Main Methods:

  • Utilizing cavity optomechanics with dual optical and mechanical resonances.
  • Developing a microscale silicon-chip-based sensor.
  • Characterizing sensor performance across kilohertz to megahertz frequencies.

Main Results:

  • Achieved noise equivalent pressures of 8-300 μPa Hz-1/2.
  • Demonstrated a dynamic range exceeding 120 dB.
  • Exceeded the sensitivity of optical resonance-only sensors and previous air-coupled sensors by orders of magnitude.

Conclusions:

  • Cavity optomechanical sensing significantly boosts ultrasound detection.
  • The developed sensor offers unprecedented sensitivity and dynamic range.
  • Potential applications include biomedical diagnostics, autonomous navigation, and single-cell analysis.