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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

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Published on: September 30, 2019

Waveguide coupling via magnetic gratings with effective strips.

Kevin M Roccapriore¹, David P Lyvers^1,2, Dean P Brown^2,3

¹Department of Physics and Advance Materials Manufacturing Processing Institute, University of North Texas, Denton, TX 76203, USA.

Applied Sciences (Basel, Switzerland)

|July 6, 2019

Summary

Complex multilayer gratings are analyzed under inclined light for waveguide and metafilms applications. A new effective medium strip model accurately characterizes their optical properties, overcoming limitations of traditional effective film approaches.

Keywords:

homogenization magnetic grating metamaterials metasurfaces waveguide coupling

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Area of Science:

Optics and Photonics
Materials Science

Background:

Complex multilayer gratings exhibit anisotropy, impacting polarization and angular optical responses.
Applications include input/output elements for waveguides and subwavelength metafilms.
Characterizing these gratings in the intermediate regime between subwavelength and diffractive modes is challenging.

Purpose of the Study:

To develop an accurate characterization method for complex multilayer gratings under inclined incident light.
To address the limitations of effective film models for gratings with periodic structures.
To provide a framework for understanding gratings as both metafilms and couplers.

Main Methods:

Studying gratings with complex multilayer strips under inclined incident light.
Utilizing an effective medium strip model instead of an effective medium layer.
Matching spectral-angular maps at various incident angles to retrieve effective strip parameters.

Main Results:

The effective medium strip model provides a more accurate characterization than the effective film model, especially under inclined illumination.
The model accounts for multilayer strips and the underlying periodic nature of the grating.
Wood's anomaly wavelength varies with the angle of incidence, highlighting the transition between modes.

Conclusions:

Effective medium strip characterization is superior for complex multilayer gratings, particularly in the intermediate regime.
This approach is versatile for describing gratings used as metafilms and for coupling light to waveguides.
The retrieved effective strip parameters enable precise optical property analysis for diverse applications.