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Also check Laurent Kerplak's lab at Dalhousie University who is also working on this topic. His home page has a picture of an integrated system. http://fizz.phys.dal.ca/~kreplak/
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I think the combination of AFM with Raman is very interesting and there are good reasons why tip-enhanced Raman scattering, despite some challenges, has been a hot research topic in recent years. Below are a few thoughts on its benefits and challenges, please let me know in the forum or offline ( tmueller...