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Optimization of multiple-slot waveguides for biochemical sensing.

Iman Khodadad, Nigel Clarke, Mohammadreza Khorasaninejad

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    This study optimizes silicon multiple-slot waveguides for optical biochemical sensors, achieving 912 nm/RIU sensitivity. This significantly enhances detection capabilities compared to single-slot designs.

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    Area of Science:

    • Photonics
    • Nanotechnology
    • Biochemistry

    Background:

    • Optical biochemical sensors are crucial for detecting analytes.
    • Silicon slot waveguides offer potential for enhanced sensor performance.
    • Existing designs may have limitations in sensitivity and detection range.

    Purpose of the Study:

    • To analyze and optimize silicon multiple-slot waveguides for optical biochemical sensing.
    • To maximize sensor sensitivity to both bulk and surface refractive index changes.
    • To explore the application of these structures in ring-resonator-based sensors.

    Main Methods:

    • Rigorous optimization of waveguide parameters (ridge width, slot width, number of slots, residual silicon).
    • Utilizing a figure of merit to guide optimization for sensitivity.
    • Investigating the multiple-slot structure in a bend configuration for ring resonators.

    Main Results:

    • Achieved a bulk sensitivity of 912 nm/refractive index unit (RIU).
    • Demonstrated a sensitivity three times higher than single-slot waveguides.
    • Successfully optimized parameters for enhanced detection of bulk and surface changes.

    Conclusions:

    • Silicon multiple-slot waveguides represent a significant advancement in optical biochemical sensing.
    • The optimized design offers superior sensitivity for detecting changes in the sensor's environment.
    • This technology holds promise for developing highly sensitive ring-resonator-based sensors.