Optional: For background on Plasma Etching, Goto Lagunita site: Online Course for general information about the online training. for general information about the Lagunita online training. Go to Go to Online Nano Course Login to log in directly to the course. to log in directly to the course. Go to the Dry Etching Section for the three videos on plasma etching principles and go to the "Choosing a Dry Etching Process" section for guidelines for choosing the right equipment.