Optical constants of several multilayer transition metal dichalcogenides measured by spectroscopic ellipsometry in the 300-1700 nm range: high-index, anisotropy, and hyperbolicity

# Data and plotting code for "Optical constants of several multilayer transition metal dichalcogenides measured by spectroscopic ellipsometry in the 300-1700 nm range: high-index, anisotropy, and hyperbolicity" by Battulga Munkhbat, Piotr Wróbel, Tomasz J. Antosiewicz, and Timur O. Shegai, ACS Photonics (2022); https://doi.org/10.1021/acsphotonics.2c00433

## Contents

* <TMD-material>: directories with raw and derived data for all 10 TMDs
* f3_dataset_*_nm_ex1_ex2_ey1_ey2_ez1_ez2.txt: obtained permittivities
* plot_*_v1.m: Matlab scripts for plotting data

## Description of the data

The raw and derived data stored in directories <TMD> contain the following files:

* <TMD>/<date>-<TMD>.SEsnap: binary data file with collected data, CompleteEASE format
* <TMD>/<date>-<TMD>-E*.mat: ascii text file with permittivity data separated into individual components as exported from CompleteEASE software
* <TMD>/<date>-<TMD>-full.mat: ascii text file with fitted model parameters as exported from CompleteEASE software
* <TMD>/<TMD>-data/*.txt: selected raw data and fits for all considered samples (Mueller Matrix or Delta/Psi/depolarization).

The structure of the data file names is as follows:
<order-number-in-CompleteEASE>-s<sample-name>-<data-type>.txt for general ellipsometry (delta, psi, depolarization) or
<order-number-in-CompleteEASE>-s<sample-name>-o<in-plane-sample-rotation-number>-mm.txt for Mueller Matrix measurements.

The following two scripts can be used to plot the raw measured data (solig lines) along with corresponding fits (black dotted lines):

* plot_mm_v1.m: Matlab script for plotting Mueller Matrix data for WTe2 and ReS2
* plot_psi_delta_depol_v1.m: Matlab script for plotting psi, delta, and depolarization data for other TMDs

The diagonal permittivity tensor data are saved in the f3_dataset_*_nm_ex1_ex2_ey1_ey2_ez1_ez2.txt files which can be plotted using the plot_permittivity_v1.m Matlab script. The format of this file is as follows:

wavelength in nanometers; real part of epsilon_xx; imaginary part of epsilon_xx;  real part of epsilon_yy; imaginary part of epsilon_yy; real part of epsilon_zz; imaginary part of epsilon_zz;