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Nested micro-ring refractive index sensor based on a subwavelength grating waveguide and the Vernier effect.

Xinyu Shi, Ming Chen, Renjie Li

    Applied Optics
    |September 14, 2023
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel nested micro-ring refractive index sensor. The sensor achieves high sensitivity and a large free spectral range, making it valuable for biosensing and environmental monitoring applications.

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    Area of Science:

    • Photonics and Optical Sensing
    • Nanotechnology and Material Science

    Background:

    • Conventional micro-ring resonant sensors face limitations in sensitivity and free spectral range.
    • Enhancing the interaction between optical fields and analytes is crucial for improved refractive index sensing.

    Purpose of the Study:

    • To propose a novel nested micro-ring refractive index sensor.
    • To enhance sensing sensitivity and free spectral range using a subwavelength grating waveguide and Vernier effect.

    Main Methods:

    • Integration of a nested micro-ring structure with a subwavelength grating waveguide.
    • Utilizing the Vernier effect to amplify wavelength shifts for increased sensitivity.
    • Characterization of sensor performance near 1550 nm wavelength.

    Main Results:

    • Achieved a high sensitivity of 8030 nm/RIU in deionized water.
    • Demonstrated a detection limit of 5.659×10-5 RIU.
    • Obtained a free spectral range of 41.956 nm with a compact footprint (35µm×25µm).

    Conclusions:

    • The proposed sensor offers significantly improved sensitivity and free spectral range compared to conventional designs.
    • The compact size and high performance make it suitable for integrated biosensing and environmental monitoring.
    • This nested micro-ring structure represents a valuable advancement in refractive index sensing technology.