Refractive Index calculator

Swanepoel method: Determination of Refractive index
of single absorbing thin film

• Step.1 The transmission spectra has been measured.
• Step.2 The transmission_max and transmission_min envelops has to be drawn.
• Step.3 Now we have the T_max and T_min at every measured wavelength.
• Step.4 Leaving the highly absorbing region,i.e the absorption edge, choose the transparent region.
• Step.5 Aprrox. for 10 to 12 wavelengths mark the T_max and T_min.
• Step.6 Use these values and the calculator below to determine the refractive index of the film at all the wavelengths where you have noted the Tmax and Tmin.
• Later one can plot refractive index Vs wave length plot in any plotting program
• I have added the entry called wavelength, only to indicate where you are calculating the refractive index.

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Wavelength 'nm':
Substrate 'n':
T max :
T min :
Thin Film Refractive index:

Note: The instructions are not complete but the calculator is useful for those who knows what to be calculated. Please read the article by Swanepoel (http://iopscience.iop.org/0022-3735/16/12/023/) then you can see the utility of this calculator. Enjoy

XRD Crystallite Size calculator

Here is the online crystallite size calculator  
Using Scherrer equation one can calculate crystallite size from XRD data.


Crystallite size = 0.94 * x ray wavelength / beta * cos (theta)

Dp Calculator : Using Scherrer formula

Wavelength:		Ang
Peak Width:		degrees
Peak Position:		degrees
Crystallite size:		nm
Lattice Strain:

Note: Don't bother about  β in radians. All the entries are in degrees. The conversions are taken care in the computing code.

Caution: The crystallite size may appear large from the above method compared to the size determined from other methods. However, these numbers will be within the tolerance limits. More suitable for entry level research students.