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Integrated plasmonic biosensor on a vertical cavity surface emitting laser platform.

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    This study presents an integrated plasmonic biosensor on a vertical cavity surface emitting laser (VCSEL) platform for ultracompact molecular detection. The device achieves high-contrast detection by monitoring light intensity changes, offering a promising solution for miniaturized sensing applications.

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    Area of Science:

    • Photonics and Nanotechnology
    • Biomedical Engineering
    • Optical Sensing

    Background:

    • Plasmonic devices offer sub-diffraction light modulation for miniaturization.
    • External light coupling systems limit the practical size of plasmonic sensors.
    • Vertical cavity surface emitting lasers (VCSELs) are compact light sources.

    Purpose of the Study:

    • To propose and demonstrate an integrated plasmonic biosensor on a VCSEL platform.
    • To enable ultracompact molecular detection with high sensitivity.
    • To overcome the footprint limitations of conventional plasmonic sensors.

    Main Methods:

    • Integration of a nanohole array plasmonic structure with a VCSEL.
    • Designing the plasmonic resonant wavelength to detune with VCSEL emission upon molecule binding.
    • Monitoring changes in light output intensity to quantify molecular concentration via refractive index changes.

    Main Results:

    • Achieved a high contrast ratio of 98.8% for molecular detection.
    • Demonstrated molecular detection at conventional concentrations.
    • The integrated sensor chip size is comparable to standard VCSEL chips (hundreds of micrometers).

    Conclusions:

    • The proposed integrated plasmonic biosensor on a VCSEL platform enables ultracompact and sensitive molecular detection.
    • This approach overcomes the bulky footprint issue associated with external coupling systems.
    • The device shows significant potential for realistic, miniaturized sensing applications.