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Wideband Optical Detector of Ultrasound for Medical Imaging Applications
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Integrated optomechanical ultrasonic sensors with nano-Pascal-level sensitivity.

Xuening Cao1,2, Hao Yang1,2, Min Wang1,2

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.

Light, Science & Applications
|March 17, 2026
PubMed
Summary
This summary is machine-generated.

A new optomechanical ultrasonic sensor offers superior sensitivity for underwater and biological applications. This photonic platform achieves record low noise-equivalent pressure, enhancing object detection and imaging capabilities.

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Area of Science:

  • Photonics
  • Optomechanics
  • Acoustics

Background:

  • Ultrasonic sensors are crucial for underwater and biological detection.
  • Conventional piezoelectric transducers face limitations in sensitivity, range, and resolution.
  • Advanced photonic sensors are surpassing traditional technologies.

Purpose of the Study:

  • To demonstrate a novel optomechanical ultrasonic sensor integrated into a photonic platform.
  • To achieve enhanced sensitivity and performance beyond conventional ultrasonic sensors.
  • To showcase the sensor's versatility in various applications.

Main Methods:

  • Integration of a suspended SiO2 membrane with a high-Q Si3N4 microring resonator.
  • Exploitation of simultaneous optical and mechanical resonances for sensing.
  • Demonstration in photoacoustic gas spectroscopy and underwater ultrasound imaging.

Main Results:

  • Record low noise-equivalent pressure (NEP) achieved: 218 nPa/Hz^1/2 at 289 kHz (air) and 9.6 nPa/Hz^1/2 at 52 kHz (water).
  • Minimum detectable C2H2 concentration of 2.9 ppm demonstrated in photoacoustic gas spectroscopy.
  • Ultrasound imaging resolution of 1.89 mm achieved in underwater applications.

Conclusions:

  • The developed optomechanical ultrasonic sensor represents a significant advancement in compact, CMOS-compatible ultrasound sensing.
  • The sensor's high sensitivity and versatility unlock new possibilities in biomedical imaging, environmental monitoring, and underwater communications.
  • This technology paves the way for next-generation ultrasonic sensing platforms.