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Dispersion analysis with inverse dielectric function modelling.

Thomas G Mayerhöfer1, Vladimir Ivanovski2, Jürgen Popp1

  • 1Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Str. 9, D-07745 Jena, Germany; Institute of Physical Chemistry, and Abbe Center of Photonics, Friedrich Schiller University, Jena D-07743, Helmholtzweg 4, Germany.

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Summary
This summary is machine-generated.

This study shows that using a Lorentz model for the inverse dielectric function improves optical property analysis of single crystals. This method simplifies dispersion parameters, enabling more accurate optical characterization, especially at higher incidence angles.

Keywords:
Dielectric function modellingDispersion analysisInfrared spectroscopyPerpendicular modesReflectance spectroscopy

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Area of Science:

  • Solid State Physics
  • Materials Science
  • Optical Spectroscopy

Background:

  • Reflectance spectra analysis is crucial for understanding optical properties of materials.
  • High angles of incidence with p-polarized light reveal specific optical modes.
  • Current methods for dispersion analysis can be complex and introduce dependencies.

Purpose of the Study:

  • To investigate the benefits of a Lorentz-type description for the inverse dielectric function in dispersion analysis.
  • To simplify the determination of dispersion parameters.
  • To enhance the accuracy of optical property descriptions for single crystals.

Main Methods:

  • Utilizing a Lorentz-type model for the inverse dielectric function.
  • Analyzing reflectance spectra, particularly at higher angles of incidence with p-polarized light.
  • Comparing spectral features to inverse dielectric functions.

Main Results:

  • Spectra at higher angles of incidence increasingly resemble inverse dielectric functions.
  • The Lorentz-type description simplifies complex dependencies of dispersion parameters.
  • This approach facilitates accurate determination of optical properties.

Conclusions:

  • A Lorentz-type description of the inverse dielectric function is advantageous for dispersion analysis.
  • This method offers a more accurate and simplified approach to characterizing optical properties of single crystals.
  • The findings are particularly relevant for high-angle reflectance spectroscopy.