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

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Published on: November 21, 2019

Magnetooptical experiments on broad absorption bands in solids.

F C Brown¹, G Laramore

¹Department of Physics and MaterialsResearch Laboratory, University of Illinois, Urbana, Illinois, USA.

|January 9, 2010

Summary

The Faraday effect studies magnetic field impacts on F-centers, a type of point defect in solids. This research derives a dispersion relation to analyze circular dichroism from Faraday rotation patterns, validated with F-centers in potassium iodide.

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Area of Science:

Solid-state physics
Materials science
Spectroscopy

Background:

F-centers are fundamental point defects in ionic crystals, characterized by broad optical absorption bands.
Understanding the influence of external fields, like magnetic fields, on these defects is crucial for materials characterization.
The Faraday effect offers a non-invasive optical method to probe magneto-optical properties of materials.

Purpose of the Study:

To investigate the effect of magnetic fields on F-centers using the Faraday effect.
To develop and apply a method for deriving circular dichroism patterns from Faraday rotation data.
To validate the theoretical framework by comparing results with experimental observations for F-centers in potassium iodide (KI).

Main Methods:

Utilized the method of moments to analyze the interaction of magnetic fields with F-centers.
Derived a dispersion relation connecting Faraday rotation and circular dichroism.
Performed numerical evaluation of the dispersion relation and compared with experimental data.

Main Results:

Successfully derived the dispersion relation necessary for calculating circular dichroism from Faraday rotation.
Numerical results for F-centers in KI were obtained using the developed method.
The calculated results showed good agreement with previously published direct experimental observations of magnetic field effects on the F-band in KI.

Conclusions:

The Faraday effect, analyzed via the method of moments and derived dispersion relations, is a viable technique for studying magnetic field effects on point defects like F-centers.
The derived dispersion relation provides a pathway to extract circular dichroism information from Faraday rotation measurements.
The study confirms the applicability of this optical method for characterizing magneto-optical properties of defects in solids.