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Implementation of a Reference Interferometer for Nanodetection
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Reference wave source based on silicon nitride waveguide in point diffraction interferometer.

Yuankai Chen, Yongying Yang, Chen Wang

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    |April 1, 2020
    PubMed
    Summary
    This summary is machine-generated.

    A novel silicon nitride waveguide reference wave source (RWS) provides a high-accuracy spherical wave for interferometry. This advanced RWS overcomes limitations of existing technologies, enabling improved optical measurements.

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    Area of Science:

    • Optics
    • Interferometry
    • Waveguide Technology

    Background:

    • The reference wave source (RWS) is critical for point diffraction interferometer performance.
    • Existing RWSs face limitations in achieving high numerical aperture (NA) and accuracy.
    • A silicon nitride waveguide RWS is proposed to address these drawbacks.

    Purpose of the Study:

    • To develop a silicon nitride waveguide RWS for generating a high-NA, high-accuracy spherical reference wave.
    • To evaluate the performance of the waveguide RWS in terms of wave accuracy and light transmittance.

    Main Methods:

    • Design of a waveguide RWS comprising a straight waveguide, bend waveguide, and Y-branch edge coupler.
    • Utilizing simulation to assess deviation from an ideal spherical wave and light transmittance.
    • Experimental verification of the NA, spot symmetry, and intensity distribution of the generated reference wave.

    Main Results:

    • Simulated peak-to-valley (PV) and root-mean-square (rms) deviations from an ideal spherical wave were 2.86×10-4λ and 4.83×10-5λ, respectively.
    • Maximum simulated light transmittance reached 24%.
    • Experimental results demonstrated a reference wave NA up to 0.58 with good circular symmetry and Gaussian intensity distribution.

    Conclusions:

    • The silicon nitride waveguide RWS effectively generates a high-accuracy spherical reference wave.
    • The design shows potential for high NA and accuracy, though experimental light transmittance is currently low (0.2%).
    • Further improvements in experimental conditions and fabrication technology are expected to enhance light transmittance.