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Thin-film grating polarizer.

D W So, S R Seshadri

|October 22, 2009

Summary

This summary is machine-generated.

This study introduces a novel polarizer using a diffraction grating on a thin-film waveguide. It selectively eliminates p-polarized radiation, enabling predominantly p-polarized output for guided modes.

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Area of Science:

Optics and Photonics
Materials Science

Background:

Thin-film planar dielectric waveguides support guided modes.
Diffraction gratings can be used to couple guided modes to radiation modes.

Purpose of the Study:

To investigate the deexcitation of guided modes in a thin-film planar dielectric waveguide.
To develop a polarizer utilizing a diffraction grating for selective radiation.
To analyze the sensitivity of the polarizer's performance to design parameter deviations.

Main Methods:

Modeling the deexcitation of guided modes.
Etching a diffraction grating on the film-cover interface.
Analyzing the generated radiation beams and polarization states.
Investigating parameter sensitivity.

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Main Results:

A diffraction grating generates a single radiation beam in the substrate.
p-polarized radiation is selectively vanished for a specified direction.
The device functions as a polarizer with predominantly p-polarized output.
Polarizer performance is sensitive to small deviations in design parameters.

Conclusions:

A novel polarizer design based on diffraction gratings in thin-film waveguides is demonstrated.
Selective vanishing of p-polarized radiation enables efficient polarization control.
Precise fabrication and parameter control are crucial for optimal polarizer performance.