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Related Experiment Videos

Size-optimized polymeric whispering gallery mode lasers with enhanced sensing performance.

Sarah Krämmer, Sanaz Rastjoo, Tobias Siegle

    Optics Express
    |April 7, 2017
    PubMed
    Summary

    Optimizing polymeric microdisk lasers by adjusting radius and thickness significantly improves their detection limit for label-free biosensing. This enhancement, validated experimentally, boosts sensor performance without compromising spectral resolution.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Biomedical Engineering

    Background:

    • Whispering gallery mode (WGM) cavities with optically active materials enable low-threshold laser emission.
    • WGM microlasers offer easy optical pumping and readout via free-space optics.
    • The evanescent field of WGMs facilitates label-free biosensing applications.

    Purpose of the Study:

    • To improve the detection limit of polymeric microdisk lasers for enhanced biosensing.
    • To investigate the impact of microdisk radius and thickness on sensor performance.
    • To optimize cavity size for improved quality factor and lasing threshold in aqueous environments.

    Main Methods:

    • Optimization of polymeric microdisk laser radius and thickness.
    • Quantification of sensing performance using bulk refractive index sensitivity.

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  • Investigation of cavity size effects on quality factor and lasing threshold.
  • Experimental validation of numerically computed expectations.

    • Main Results:

    • Detection limit of polymeric microdisk lasers improved by over a factor of seven.
    • Enhanced bulk refractive index sensitivity achieved while maintaining spectral resolution.
    • Cavity size optimization demonstrated for improved quality factor and lasing threshold in aqueous environments.

    Conclusions:

    • Microdisk laser optimization offers a pathway to significantly enhanced label-free biosensing.
    • Precise control over microcavity dimensions is crucial for optimizing sensor performance.
    • The study validates theoretical predictions with experimental results, confirming the potential of WGM microlasers in biosensing.