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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

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Diffractive-optic polarization-sensing element for magneto-optic storage heads.

R K Kostuk, T J Kim, G Campbell

|October 27, 2009

Summary

This summary is machine-generated.

This study evaluates a novel holographic optical sensor for magneto-optic data storage. The sensor, combining beam splitters, can detect minute polarization rotations crucial for advanced data storage applications.

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Area of Science:

Optics and Photonics
Materials Science
Data Storage Technology

Background:

Magneto-optic data storage requires sensitive polarization detection.
Holographic optical elements offer compact and efficient solutions.

Purpose of the Study:

To evaluate a cascaded planarized holographic optical sensor for magneto-optic pickup heads.
To compare two grating reconstruction designs for optimal performance.

Main Methods:

A sensor combining leaky and polarization beam splitters was designed and fabricated.
Two cascaded grating designs were analyzed, one with a half-wave plate and one without.
Grating fabrication utilized dichromated gelatin emulsions.

Main Results:

The fabricated sensor systems demonstrated the ability to detect 0.5-degree polarization rotations.
Differential detection systems enhanced the sensitivity of the polarization measurements.

Conclusions:

The evaluated holographic optical sensor is a viable candidate for magneto-optic data storage pickup heads.
The proposed designs offer high sensitivity for detecting polarization state changes.