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Submillimeter Sized 2D Electrothermal Optical Fiber Scanner.

Mandeep Kaur1, Carlo Menon1,2

  • 1MENRVA Research Group, Schools of Mechatronic Systems Engineering and Engineering Science, Simon Fraser University, Surrey, BC V3T 0A3, Canada.

Sensors (Basel, Switzerland)
|January 8, 2023
PubMed
Summary

This study introduces a novel single electrothermal actuator for optical fiber scanners, enabling 2D scanning for medical imaging. This innovation simplifies device design and enhances diagnostic capabilities in minimally invasive procedures.

Keywords:
MEMScantilever beamelectrothermal actuatorimagingoptical scannerresonance

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Area of Science:

  • Medical Imaging
  • Optical Engineering
  • Biomedical Devices

Background:

  • Optical scanners are crucial in medical imaging for cancer diagnosis, surgery assistance, and lesion detection.
  • Miniaturized endoscopic scanners utilize optical fibers as vibrating cantilevers for imaging.
  • Current 2D scanning methods often require multiple actuators to vibrate the optical fiber.

Purpose of the Study:

  • To propose and optimize a single electrothermal actuator for bidirectional excitation of a cantilever optical fiber.
  • To achieve two-dimensional (2D) scanning using a single actuator for enhanced endoscopic imaging.
  • To explore the potential of a single actuator to simplify the design of optical scanning devices.

Main Methods:

  • An electrothermal actuator was designed and optimized to induce bidirectional displacement.
  • A periodic current at the cantilever fiber's resonant frequency was applied to the actuator.
  • The resulting vibration pattern of the optical fiber tip was analyzed.

Main Results:

  • The optimized electrothermal actuator successfully provided bidirectional (horizontal and vertical) displacement to the cantilever fiber.
  • The vibrating fiber tip traced a circular pattern when actuated at its resonant frequency.
  • Adjusting the actuation frequency allowed for scanning areas within the circular path.

Conclusions:

  • A single electrothermal actuator can effectively achieve 2D scanning with an optical fiber cantilever.
  • This approach offers a simplified and potentially more cost-effective solution for endoscopic optical scanners.
  • The findings pave the way for advanced, miniaturized medical imaging devices.