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RefFIT is a compact interactive program for Windows 95, 98, NT, XP designed to fit optical spectra, such as reflectivity, transmission, ellipsometry etc. with the Drude-Lorentz and many other physically sensible models. It can be useful to physicists, material scientists, chemists and everyone else using optical techniques to analyze materials. With RefFIT you are able to fit several types of data simultaneously and monitor precisely what you are doing. RefFIT is the only existing program which allows you to apply the Kramers-Kronig analysis not only to the normal-incidence reflection, but also transmission, grazing-incidence reflection, ellipsometry and other types of data, using a novel variational technique. RefFIT has a built-in macro language to perform lengthy routines with a single mouse click. The complete RefFIT manual is available. At the moment, the program is at a development stage. You are welcome to try it and give me your comments and suggestions. Please, show it to your colleagues. I would also appreciate if you mention in your publications that you used RefFIT in the analysis. You can download the latest version of the program. In order to install it on your computer, copy all the files from this archive to a separate directory, for instance, “C:\REFFIT”, keeping the directory structure. To start it, run “REFFIT.EXE”. I wish you a successful fitting!
Alexey Kuzmenko, University of Geneva Email: Alexey.Kuzmenko@unige.ch |
Here are some screenshots of RefFIT (click to enlarge them):
| Drude-Lorentz fitting of the c-axis reflectivity spectrum of Bi2Sr2CaCu2O8 (Bi-2212) |
Simultaneous fitting of reflectivity andtransmission spectra of La2-xSrxCuO4 (LSCO) |
Simultaneous fitting of ellipsometric parameters (ψ,Δ) for 3 angles of incidence of a Pb(ZrTi)O3 film on a SrTiO3 substrate |
Simultaneous fitting of FIR reflectivity, NIR-UV dielectric function and DC conductivity of CeIrIn5 |
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| Fitting of spectra of SrTiO3 from 10 to 30000 cm-1: |
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RefFIT developments:
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16.11.2010 |
Complex transmission phase of a slab sample can be calculated |
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22.10.2010 |
Magnetooptical model is extended to the Voigt geometry |
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31.08.2010 |
A powerful magnetooptical model is included, which involves the optical Hall effect and the associated Faraday and Kerr effect |
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10.04.2009 |
It is possible to save variational dielectric functions (VDFs) in a separate file |
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13.10.2008 |
Reflectance/Tranmittance/Ellipsometry measurements on multilayer samples with (possibly) suppressed Fabry-Perot effect can be modeled |
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04.04.2007 |
Reffit can calculate the absorption coefficient |
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27.03.2007 |
It is possible to limit the parameter values to an interval |
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10.10.2006 |
A model is added to fit reflectivity of a sample embedded into a medium (can be useful for experiments when a sample is in a liquid or in a pressure cell) |
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19.12.2005 |
A model of the electronic conductivity in the Marginal Fermi-liquid theory is added |
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21.09.2005 |
The possibility to fit the complex phase of the reflection and transmission is added, which is useful for the analysis of the spectra measured with time-domain THz spectrometers and BWO-based spectrometers |
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20.08.2005 |
A model for the electron-phonon interaction is introduced |
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19.06.2005 |
New model: “Optics of a plate sample”. Now the incoherence between multiple reflections is properly treated |
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17.03.2005 |
RefFIT can now calculate (and fit also!) the integrated spectral weight |
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10.11.2004 |
The possibility of a frequency-dependent magnetic permeability μ(ω)≠1 is added |
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02.08.2004 |
The factorized (TO-LO) model for the dielectric function is added |
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25.05.2004 |
This webpage was opened |
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27.03.2007 |
It is possible to limit the parameter values to an interval |
|
10.10.2006 |
A model is added to fit reflectivity of a sample embedded into a medium (can be useful for experiments when a sample is in a liquid or in a pressure cell) |
| 19.12.2005 |
A model of the electronic conductivity in the Marginal Fermi-liquid theory is added |
| 21.09.2005 |
The possibility to fit the complex phase of the reflection and transmission is added, which is useful for the analysis of the spectra measured with time-domain THz spectrometers and BWO-based spectrometers |
| 20.08.2005 |
A model for the electron-phonon interaction is introduced |
| 19.06.2005 |
New model: “Optics of a plate sample”. Now the incoherence between multiple reflections is properly treated |
| 17.03.2005 |
RefFIT can now calculate (and fit also!) the integrated spectral weight |
| 10.11.2004 |
The possibility of a frequency-dependent magnetic permeability μ(ω)≠1 is added |
| 02.08.2004 |
The factorized (TO-LO) model for the dielectric function is added |
| 25.05.2004 |
This webpage was opened |
Last updated: 31. 08.2010