I have a thin film of a fluorescent material and want to make a reference sample with similar reflection in both visible and infrared to do the comparison. How can I make the reference sample?
Hello Samira,
I would use materials with similar refractive index in this range of wavelength`s n.
The reflectivity (for vertical incidence of light) is given by
R = [ (n-1)/(n+1)]2
Absorbing materials have an imaginary part. This is more complex.
For thin transparent layers (Thickness t is comparable with the wavelength) interferences must be taken into account. Here, it is important, to compare layers with equal thickness.
With regards
R. Mitdank
Since there is no fluorescence without absorption, it is indeed the complex index of refraction that must match. I would consider this as really challenging, since the oscillator strengths and the position as well as the damping of all absorptions of original material and reference must match...
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