Chris Korman
03-02-2011, 12:20 AM
Here is a photo of what is known as a comet. If you pour a polymer solution known as a resist on to a surface but the surface has some small debris, the debris actually blocks the flow of the polymer solution creating a comet like structures when the surface is spun at high speed. In this case the polymer is a type of polystyrene which has been subsequently etched by a reactive gas. The yellow/white circle is silicon.
These things reduce yield but they are very colorful because the polymer is very thin which creates different colorations at different thicknesses, much in the same way you see colors in a soap bubble.
http://webs.lanset.com/hypoploi/jpeg/polymeric-comet.jpg
Color corrected and cropped. 10X Magnification.
These things reduce yield but they are very colorful because the polymer is very thin which creates different colorations at different thicknesses, much in the same way you see colors in a soap bubble.
http://webs.lanset.com/hypoploi/jpeg/polymeric-comet.jpg
Color corrected and cropped. 10X Magnification.