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Related Concept Videos

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Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution
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    This summary is machine-generated.

    We developed an integrated optical probe for common-path swept-source optical coherence tomography (OCT). This probe simplifies the system by using an on-chip microlens and eliminating the need for a separate reference arm, improving signal strength and enabling ghost image suppression.

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    Area of Science:

    • Biomedical Optics
    • Optical Engineering
    • Photonics

    Background:

    • Common-path swept-source optical coherence tomography (OCT) systems offer advantages but often require complex reference arms.
    • On-chip integration of optical components can lead to miniaturization and improved performance.
    • Dispersion and coupling losses are significant challenges in OCT system design.

    Purpose of the Study:

    • To demonstrate an integrated optical probe for a common-path swept-source OCT system.
    • To eliminate the need for external optical elements and dispersion compensation.
    • To enhance signal strength and enable ghost image suppression.

    Main Methods:

    • An on-chip microlens was integrated into a silicon oxynitride waveguide for light coupling.
    • A common-path design utilized the waveguide end facet as the reference plane.
    • A symmetric Y junction with a wavelength-independent splitting ratio was employed.
    • An extended Fourier-domain OCT model was used for ghost image suppression.

    Main Results:

    • The integrated probe eliminated the need for a dispersive on-chip loop reference arm and external coupling optics.
    • The on-chip microlens provided a signal enhancement of up to 37 dB.
    • A signal-to-noise ratio of 71 dB was achieved with 2.6 mW of power.
    • Cross-sectional OCT images of a phantom sample were successfully demonstrated.
    • Ghost image suppression was experimentally validated.

    Conclusions:

    • The integrated optical probe offers a simplified and more efficient common-path swept-source OCT system.
    • The on-chip microlens significantly improves signal coupling and overall system performance.
    • The developed system effectively suppresses ghost images, enhancing image quality.