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Published on: November 30, 2012
Analytical method for the identification of a thin-strip defect in a planar waveguide
Ran Liao1, Vladimir Romanov, Sailing He
1Centre for Optical and Electromagnetic Research, Hangzhou, China.
Summary
This study presents a fast, nondestructive method to locate and measure thin-strip defects in planar waveguides. The technique uses scattered field measurements at two frequencies for reliable defect reconstruction.
Area of Science:
- Optics and Photonics
- Waveguide Theory
- Non-Destructive Testing
Background:
- Planar waveguides are crucial in optical systems.
- Detecting internal defects is essential for device reliability.
- Existing methods for defect reconstruction can be complex or limited.
Purpose of the Study:
- To develop a nondestructive method for reconstructing thin-strip defects in planar waveguides.
- To provide explicit formulas for quick defect characterization.
- To validate the method's reliability across various defect locations.
Main Methods:
- Utilizing scattered field measurements from the waveguide ends.
- Employing two distinct frequencies for analysis.
- Developing analytical reconstruction formulas.
Main Results:
- Explicit reconstruction formulas were derived for defect location and width.
- Numerical simulations confirmed the analytical method's effectiveness.
- The method demonstrated reliability irrespective of the defect's position.
Conclusions:
- A rapid and reliable analytical method for nondestructive defect reconstruction in planar waveguides is established.
- The technique is effective for small-width defects.
- This approach enhances quality control for optical waveguide devices.
