What type of microscope I can use to know the 2-D morphology of my bio-composite sample with thickness of 3 mm?

I have used SEM before, but the results are not clear, and I have used an optical microscope ( Nikon Eclipse Lv100POL), but the light couldn't pass through. I am interested in impurities, voids,...

23 April 2021 5,664 3 View