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Large-Area Biocompatible Random Laser for Wearable Applications.

Kun Ge1, Dan Guo1, Xiaojie Ma1

  • 1Faculty of Science, College of Physics and Optoelectronics, Beijing University of Technology, Beijing 100124, China.

Nanomaterials (Basel, Switzerland)
|August 7, 2021
PubMed
Summary

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Researchers developed a large-area, flexible random laser using PMMA, RhB, and gold nanorods. This biocompatible wearable sensor technology offers tunable wavelengths for motion and humidity detection.

Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Optics

Background:

  • Wearable sensor technology is crucial for health monitoring.
  • Existing sensors have limitations in customization and large-area application.
  • Random lasers offer unique properties for sensing applications.

Purpose of the Study:

  • To design a simple, cost-effective fabrication method for large-area biocompatible random lasers.
  • To customize wearable sensors using random laser technology.
  • To explore the potential of these lasers for motion and humidity sensing.

Main Methods:

  • Fabrication of a large-area random microcavity using polymethyl methacrylate (PMMA) as a matrix.
  • Incorporation of rhodamine B (RhB) as a gain medium and gold nanorods (Au NRs) for plasmonic feedback via spin-coating.
Keywords:
biocompatiblelarge-areapolymer filmrandom laserwearable

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  • Optical excitation to achieve coherent random lasing.

    • Main Results:

    • Successful attainment of coherent random lasing with a narrow linewidth (~0.4 nm) at a low threshold (~23 μJ/cm²).
    • Demonstration of tunable lasing wavelength (612.6–624 nm) by mechanically altering Au NR spacing in the flexible film.
    • The tuning process was found to be recoverable.

    Conclusions:

    • A designable and simple method for fabricating large-area biocompatible random lasers was demonstrated.
    • The flexible random laser film shows potential for wearable applications, including motion and relative-humidity sensing on human skin.
    • This technology advances the development of customized wearable sensors.