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An acousto-optic sensor based on resonance grating waveguide structure.

Antonio Jou Xie1, Fuchuan Song1, Sang-Woo Seo1

  • 1Department of Electrical Engineering, The City College of New York, 160 Convent Avenue, New York, NY 10031, USA, swseo@ccny.cuny.edu.

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Summary

This study introduces an acousto-optic (AO) sensor using a resonance grating waveguide for ultrasound detection. The elastic polymer sensor effectively converts ultrasound pressure waves into light intensity modulation for imaging applications.

Keywords:
acousto-opticpolymer sensorresonance grating waveguideultrasound sensor

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Area of Science:

  • Photonics
  • Acoustics
  • Materials Science

Background:

  • Acousto-optic (AO) sensors offer potential for ultrasound detection.
  • Resonance grating waveguide structures provide a sensitive platform for sensing.
  • Elastic polymer materials enable sensitivity to pressure waves.

Purpose of the Study:

  • To present a novel acousto-optic sensor based on a resonance grating waveguide structure.
  • To investigate the sensor's sensitivity and performance for ultrasound pressure waves.
  • To explore the potential for two-dimensional optical pressure imaging.

Main Methods:

  • Fabrication of an AO sensor using elastic polymer materials.
  • Characterization of the sensor using a 20 MHz ultrasound transducer.
  • Investigation of optical resonance shift due to ultrasound pressure.
  • Analysis of detection sensitivity across different optical source wavelengths.

Main Results:

  • The fabricated sensor demonstrates sensitivity to ultrasound pressure waves.
  • Ultrasound pressure induces a measurable optical resonance shift and light intensity modulation.
  • Detection sensitivity was investigated within the resonance spectrum.
  • The sensor's planar geometry is suitable for 2D imaging.

Conclusions:

  • The developed acousto-optic sensor effectively detects ultrasound pressure waves.
  • The sensor's design is promising for applications in pressure wave detection, mapping, and ultrasound imaging.
  • The resonance grating waveguide structure in elastic polymers provides a viable platform for optical pressure sensing.