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Integrated refractive index sensor using silicon slot waveguides.

Ka Li, Xue Feng, Kaiyu Cui

    Applied Optics
    |April 18, 2017
    PubMed
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    This study introduces a novel integrated refractive index sensor using evanescent field absorption in silicon slot waveguides. The sensor achieves high sensitivity for detecting refractive index changes, enabling portable, single-chip sensing applications.

    Area of Science:

    • Photonics and Optical Sensing
    • Integrated Optics
    • Nanophotonics

    Background:

    • Refractive index (RI) sensing is crucial for various applications, including chemical and biological detection.
    • Existing RI sensors often face limitations in sensitivity, portability, and integration.

    Purpose of the Study:

    • To propose and demonstrate an integrated refractive index sensor based on evanescent field absorption (EFA) within a silicon slot waveguide.
    • To achieve high-sensitivity RI detection with a compact and portable sensor design.

    Main Methods:

    • Design of a silicon slot waveguide structure for EFA-based RI sensing.
    • Numerical simulations to analyze the sensor's performance and operating principle.
    • Optimization of structural parameters to enhance detection sensitivity.

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    Main Results:

    • The proposed RI-EFA sensor translates RI variations into measurable changes in attenuation coefficient and output power.
    • Achieved a detection limit of approximately 10-8 RIU for homogeneous sensing and 10-7 RIU for surface sensing.
    • Demonstrated the potential for high sensitivity with optimized structural parameters at 1064 nm wavelength.

    Conclusions:

    • The developed RI-EFA sensor offers a promising approach for integrated and portable sensing on a single chip.
    • The sensor's reliance on a straight slot waveguide and optical power detection simplifies fabrication and operation.
    • This technology holds potential for advancements in lab-on-a-chip devices and real-time monitoring systems.