- I deposited 100 nm-thick Pt electrode ( circle pattern) on oxide films ( in dark grey color) , It is obviously visible under observation with the naked eye in nature light. But if I want observe the sample by using Optical microscope (x 100,yellow lamp light ), the Pt electrode become nearly invisible, looks like disappeared( but it exists indeed). In other words, there is nearly no contrast between Pt electrode and film. Why? optical magic? The Extinction induced by light interference?
Angel Cuesta
I fully agree with Christian. The thickness of the film should not be a problem at all, you need only some tens of atomic layers for a Pt film (or a film of any other metal) to have the optical properties of the surface of bulk Pt. The diffraction limit of optical microscopy applies only to its lateral resolution (which does not seem to be a problem since you can see the circular Pt deposits with the naked eye). Very high vertical resolution can be achieved with optical methods (e.g., interferometry). I also think that the reason must be that with the naked eye you only detect specular reflection.
Cheers,
Angel
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