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This study introduces a new method for analyzing terahertz (THz) spectroscopy data, accurately determining material properties like refractive index in complex multilayer samples. The open-source package provides a more reliable alternative to common approximations.

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Area of Science:

  • Physics
  • Materials Science
  • Spectroscopy

Background:

  • Terahertz (THz) spectroscopy enables precise measurement of material properties, including refractive index and conductivity.
  • Extracting complex refractive indices from THz time-domain spectroscopy data is challenging for multilayer samples due to numerous transmission-reflection paths.
  • Existing approximation methods for THz data analysis are limited in applicability and can yield inaccurate results.

Purpose of the Study:

  • To develop a robust and widely applicable method for accurately extracting complex refractive indices from THz time-domain spectroscopy data of multilayer samples.
  • To provide an open-source software package implementing this novel analysis method.

Main Methods:

  • Modeling all possible transmission-reflection paths of THz pulses through multilayer samples as a branching tree structure.
  • Generating analytical expressions that relate the unknown refractive index to the observed time-domain data.
  • Implementing the method in an open-source MATLAB library and a standalone graphical user interface (GUI).

Main Results:

  • The developed tree-based path modeling method accurately extracts complex refractive indices from THz spectroscopy data.
  • Comparison with commonly used approximations shows superior accuracy and wider applicability of the new method.
  • The open-source package 'nelly' is validated for diverse sample types.

Conclusions:

  • The novel path-modeling approach offers a significant improvement over traditional approximations for THz spectroscopy data analysis.
  • The freely available 'nelly' package democratizes access to advanced THz material characterization.
  • This method enhances the reliability and scope of applications for THz time-domain spectroscopy.