Calculating Color of Matter Using Optical Reflectivity

[dakold]

How can one say what color a matter have by using optical reflectivity? I know how to calculate the plasmon energy and out of that can one can get the wavelength. So can one get the color of the wavelength or?

Thanks

 

[Gokul43201]

If the reflection spectrum is relatively narrow, and peaked about a particular wavelength in the visible range, you can simply look up a chart like this one: http://hyperphysics.phy-astr.gsu.edu/hbase/vision/specol.html#c1

If the relfection spectrum is anything else (broad or multimodal, for instance), you will have to resort to more sophisticated methods. If it is multimodal with each peak being narrow, then you can determine the resulting color by simply adding the individual components weighted by their peak (or integrated, depending on how similar the linewidths are) intensities.