First of all, I wish you a very good new year.
After the first subject about CD and DVD pits,
http://www.photomacrography.net/forum/v ... hlight=dvd
I followed with the blu-ray ones.
Actually I have not seen any phtonic microscope view instead of SEM
Informations (pits) on metallic area are very close to the outside area and only protected by a very hard plastic of some 1/10 mm. So you do not need to peel off any plastic layer. But for a better view, you have to use episcopic light, polarized light but ICR is better.
Oil is directly put on the disk area.
Episcopic light with interférential contrast (ICR)
cool light LED 6500K (~ 520nm)
Objectives : pl apo 63/1,40 and Splanapo 100/1,40
As the gap between two lines of pits is exactly 0.32µm, it wa easy to draw the scale for 10 lines. the most little pits are 150nm in diameter.
I suppose that it is a diffracted image that we see as I cannot go down better than 180-200nm (theorical calculation)
Jean-Marc