Can I import my own tabulated material data?#

Yes, users can import their own tabulated material data and fit it using one of Tidy3D’s dispersion fitting tools. The FastDispersionFitter tool performs an optimization to find a medium defined as a dispersive PoleResidue model that minimizes the RMS error between the model results and the data. The user can provide data through one of the following methods:

• Numpy arrays directly by specifying wvl_um, n_data, and optionally k_data.

• A data file with the from_file utility function. The data file has columns for wavelength ($\mu m$), the real part of the refractive index ($n$), and the imaginary part of the refractive index ($k$). $k$ data is optional. Note: from_file uses np.loadtxt under the hood, so additional keyword arguments for parsing the file follow the same format as np.loadtxt.

• URL link to a CSV/TXT file that contains wavelength ($\mu m$), $n$, and optionally $k$ data with the from_url utility function. URL can come from refractiveindex.

This notebook provides detailed instructions and examples of using the fitter.