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Wavelength-time-division multiplexed fiber-optic sensor array for wide-field photoacoustic microscopy.

Wei Li1, Xiaoxuan Zhong1, Jie Huang1

  • 1Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, College of Physics & Optoelectronic Engineering, Jinan University, Guangzhou, China.

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Summary

A new wavelength-time-division multiplexed (WTDM) fiber-optic sensor array expands the field of view in photoacoustic microscopy (PAM). This innovation enables simultaneous, high-resolution imaging of larger biological areas for advanced biomedical applications.

Keywords:
Fiber-optic sensorsHemodynamic monitoringPhotoacoustic microscopyWavelength-time-division multiplexingWide-field imaging

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Area of Science:

  • Biomedical Optics
  • Photoacoustic Imaging
  • Fiber Optic Sensing

Background:

  • Photoacoustic microscopy (PAM) faces a sensitivity-field of view (FOV) trade-off.
  • Optical ultrasound sensors offer high sensitivity but challenging multichannel implementation.
  • Existing PAM systems struggle to balance FOV with detection sensitivity.

Purpose of the Study:

  • To develop a novel fiber-optic sensor array for enhanced PAM.
  • To overcome the limitations of traditional PAM systems in achieving large FOV and high sensitivity.
  • To enable efficient multichannel detection in PAM through a single photodetector.

Main Methods:

  • A wavelength-time-division multiplexed (WTDM) fiber-optic sensor array was designed.
  • Individual sensors were assigned distinct wavelengths and varying-length delay fibers for temporal separation.
  • A 4-element sensor array was used to achieve multichannel detection via a single photodetector.

Main Results:

  • An expanded FOV of 5 × 8 mm² was achieved.
  • High temporal resolution (160 kHz A-line rate, 0.25 Hz frame rate) and microscopic spatial resolution (10.7 μm) were maintained.
  • Comparative monitoring of mouse cerebral and intestinal hemodynamics during hypercapnia challenge demonstrated distinct temporal recovery patterns.

Conclusions:

  • The WTDM fiber-optic sensor array effectively expands FOV in PAM without compromising resolution or sensitivity.
  • This approach provides a promising platform for large-field, high-speed photoacoustic imaging.
  • The system demonstrated utility in comparative hemodynamic monitoring of different vascular beds in vivo.