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Database of Optical Constants -- Misc: computer codes

Computer programs


Codes to transform the standard data files

The original files with the data were in different formats. To simplify their application we used to bring the files to a selected form: the fixed quantities in columns and fixed formats of numbers. Such files were named "standard data files" and linked to the database. They can be easily transformed to any desirable format by a code. Here we present two simple computer programs of this kind.

The first code allows you to make a simple transformation. When running the code, you can specify columns in the output file: wavelength, energy (eV) or wavenumber (cm-1) as the first column, and complex refractive index or dielectric function as the second and third columns. The input and output filenames and formats of data are unchangeable: IN and OUT and format (E11.4, 2E14.5), respectively. The code is written in the standard Fortran.

A more advanced code goes further in the transformation. When running the code, you can not only select the output function (refractive index or dielectric function vs wavelength, energy or wavenumber), but also specify the input and output filenames and all output data formats. The code is written in the standard Fortran.

Mie code for spheres

Light scattering by homogeneous spheres (described by Mie theory) is often used in applications of the optical constants. There are a lot of computer codes simulating this scattering and freely available in Internet (see links on the main page of the database).
  Here we present our simple Fortran code to calculate the optical properties (efficiencies, albedo, asymmetry factor) of spheres. The input parameters are the refractive index and the size parameter(s). Calculations with the test input file should lead to the results given in our output file.

SVM code for spheroids

Prolate/oblate spheroids of different aspect ratios are a good representative of the wide class of non-spherical particle shapes. The light scattering by spheroids can be treated by various methods (links to some codes available in Internet are given on the main page). In the most consistent way the scattering geometry is involved in the calculations by the Separation of Variables Method (SVM). Here we present a code that simulates the optical properties of homogeneous spheroids basing on the SVM. The code and its brief description are presented on our SVM code page.

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Last modified: 25/10/98, V.I.