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Kezako ?!? | by erwannf
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Kezako ?!?

This is the inner surface of the quartz tube of a plasma-enhanced chemical vapor depostion (PECVD) system, after a large number of depositions. Depending on the number and on the optical properties of the layers deposited on this surface, there are interferences leading to different colors. See for instance en.wikipedia.org/wiki/Thin-film_interference. The peculiar shape is related to the design of the sample holder (www.flickr.com/photos/erwannf/12536907095/).

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Taken on February 13, 2014