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Related Concept Videos

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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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Published on: August 30, 2012

Interferometric method for measuring diffused channel waveguide-index profile.

L Goldberg

    Applied Optics
    |April 8, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces an interferometric technique to measure refractive index changes in optical waveguides. The method non-destructively maps index variations, aiding in waveguide characterization.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Waveguide Optics

    Background:

    • Characterizing refractive index profiles in optical waveguides is crucial for device performance.
    • Existing methods for measuring index distribution can be destructive or lack lateral resolution.
    • Diffused channel waveguides in materials like Lithium Niobate (LiNbO3) are key components in photonic integrated circuits.

    Purpose of the Study:

    • To develop and demonstrate a non-destructive interferometric method for measuring refractive index change distribution in diffused channel waveguides.
    • To analyze both surface and lateral index variations.
    • To validate the technique by comparing experimental results with theoretical models.

    Main Methods:

    • Utilized Young's fringes generated by interference between a point light source and its surface reflection.
    • Employed an experimental setup similar to end-fire coupling for waveguide excitation.
    • Investigated the possibility of depth profiling through successive substrate layer removal.

    Main Results:

    • Achieved non-destructive measurement of surface refractive index change and lateral index distribution.
    • Measured maximum surface ordinary index changes of 4.2 x 10^-3 and 8.5 x 10^-3 for different Titanium (Ti) film thicknesses.
    • Experimental lateral index dependencies closely matched theoretical error function profiles with a diffusion coefficient of 1.0 x 10^-12 cm^2/sec.

    Conclusions:

    • The described interferometric method provides an effective non-destructive means to characterize refractive index changes in diffused channel waveguides.
    • The technique accurately determines surface index changes and lateral index distribution.
    • Further application with layer removal can enable full 3D refractive index profiling.