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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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Optical properties of amorphous metals using a ratio reflectance method.

|June 26, 2010

Summary

This study introduces a more accurate method for calculating amorphous metal optical properties using a modified Kramers-Kronig relation. The approach improves optical phase accuracy, especially when low photon energy reflectivity follows the Hagen-Rubens equation.

Area of Science:

Materials Science
Condensed Matter Physics
Optics

Background:

Accurate calculation of optical properties is crucial for understanding material behavior.
Traditional methods for deriving optical properties from reflectivity data can be limited in accuracy.
The Hagen-Rubens equation accurately describes reflectivity at low photon energies for some amorphous metals.

Purpose of the Study:

To develop a more accurate method for calculating the optical properties of amorphous metals.
To leverage the Kramers-Kronig relation for improved optical phase determination.
To demonstrate the method's efficacy using amorphous Fe(80)B(20) as an example.

Main Methods:

Utilizing the Kramers-Kronig relation, a fundamental principle in optics.

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Expressing the Kramers-Kronig relation in terms of a ratio reflectance.

Applying the Hagen-Rubens equation to describe low photon energy reflectivity.

Main Results:

The proposed method yields optical phase with significantly greater accuracy compared to regular approaches.
The accuracy improvement is particularly notable when the Hagen-Rubens equation is applicable.
Optical properties of amorphous Fe(80)B(20) were successfully derived using this enhanced method.

Conclusions:

The modified Kramers-Kronig approach offers a superior method for determining optical properties of amorphous metals.
This technique enhances the reliability of optical measurements and material characterization.
The findings are applicable to amorphous metals exhibiting Hagen-Rubens behavior at low photon energies.