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Transferable microfiber laser arrays for high-sensitivity thermal sensing.

Jun Ruan1, Yixuan Li1, Junzhe Lin1

  • 1College of Physics and Optoelectronics, Faculty of Science, Beijing University of Technology, Beijing 100124, China. trzhai@bjut.edu.cn.

Nanoscale
|October 13, 2023
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Summary
This summary is machine-generated.

Researchers developed a novel microfiber laser array for highly sensitive thermal sensing. This stable, transferable device integrates plasmonic gold nanorods with polymer fibers for precise temperature monitoring.

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Area of Science:

  • Materials Science
  • Optics and Photonics
  • Nanotechnology

Background:

  • Functional microfibers offer diverse applications, including health monitoring and luminescence.
  • Polymer fiber-based microlasers are promising due to their color, quality, and fabrication ease.
  • Developing stable microfiber lasers for high-sensitivity thermal sensing remains a challenge.

Purpose of the Study:

  • To design and fabricate a stable, transferable membrane with whispering-gallery-mode plasmon hybrid microlaser arrays for thermal sensing.
  • To investigate the thermo-optical effect for precise temperature detection.
  • To achieve high sensitivity and a low limit of detection for thermal sensing applications.

Main Methods:

  • Integration of plasmonic gold nanorods with polymer lasing microfiber arrays embedded in a polydimethylsiloxane (PDMS) matrix.
  • Fabrication of whispering-gallery-mode (WGM) lasing arrays.
  • Characterization of lasing peak shift in response to temperature variations.

Main Results:

  • Achieved high-quality WGM lasing arrays.
  • Demonstrated a lasing peak shift of 1.462 nm over a temperature range of 30.6 °C to 38.7 °C.
  • Obtained a thermal sensing sensitivity of 0.181 nm/°C, a limit of detection of 0.131 °C, and a figure of merit of 2.961 °C-1.
  • Maintained a stable laser linewidth due to plasmon-enhanced photon confinement and reduced scattering loss.

Conclusions:

  • The proposed design offers a facile approach for fabricating high-sensitivity on-chip thermometry devices.
  • The plasmon hybrid microlaser arrays show significant potential for advanced thermal sensing applications.
  • The integration of plasmonic nanoparticles and polymer microfibers enhances device performance and stability.