how to draw ralation between absorption coefficien and wavelengthfrom Real part of the dielectric data and Imaginary part of the dielectric
thanks
Dear Solh,
The complex refractive index N can be written:
N = n - ik
with n the refractive index and k the extinction coefficient (here not the wave vector) and i the imaginary unit.
The dielectric function is eps = n2 - k2 - 2ink
The absorbtion coefficient alfa then can be expressed:
alfa = 4*pi*k/lambda
with lambda the wavelength.
With Regards
R. Mitdank
Solh Abdulrahman,
M. Dresselhaus has a nice chapter about this very topic. In the first chapter (notably Eqs. 1.25 and 1.26) she gives the relationship between the complex dielectric tensor and a number of important optical properties. The absorption being one of them.
In short, given the real and imaginary parts of the dielectric function (eps1 and eps2) you can find the index of refraction *n* and extinction coefficient *k*. Using *n* and *k* you can then find the absorption coefficient (alpha) and many other optical properties.
A link to the chapter is:
http://web.mit.edu/course/6/6.732/www/6.732-pt2.pdf
-Nick
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