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Related Experiment Video

Updated: Jun 20, 2026

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
12:18

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Published on: August 5, 2013

Measured TM-TM coupling in waveguide gratings.

L A Weller-Brophy, D G Hall

    Optics Letters
    |September 11, 2009
    PubMed
    Summary
    This summary is machine-generated.

    We measured waveguide grating reflectivity, finding that local-normal-mode theory better predicts the response than ideal-mode theory for surface corrugations.

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    Area of Science:

    • Optics and Photonics
    • Waveguide physics
    • Nanophotonics

    Background:

    • Periodic waveguide gratings are crucial optical components.
    • Understanding their reflectivity is essential for device design.
    • Surface corrugations introduce complex field interactions.

    Purpose of the Study:

    • To experimentally measure the guided-wave reflectivity of a surface-corrugated waveguide grating.
    • To compare the accuracy of different theoretical models in describing the measured response.
    • To determine the most suitable theoretical framework for analyzing such gratings.

    Main Methods:

    • Measurements of guided-wave reflectivity were performed.
    • The experiment varied incidence angle and polarization.

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  • Results were compared against predictions from coupled-mode theories.

    • Main Results:

    • The study presents detailed reflectivity measurements.
    • Guided-wave reflectivity was found to be dependent on incidence angle and polarization.
    • The coupled-mode theory utilizing local-normal-mode expansion showed superior agreement with experimental data.

    Conclusions:

    • The local-normal-mode expansion provides a more accurate description of waveguide grating reflectivity compared to the ideal-mode expansion.
    • This finding has implications for the precise modeling and design of photonic devices with surface gratings.
    • Accurate theoretical models are critical for advancing waveguide-based technologies.