Patent ID: 6755932
Filing Date: 2004-06-29
Classification: G01N,H01J,H01L

Abstract:
A plasma processing apparatus comprising:a sample bench located in a vacuum chamber; a conductive plate member coupled to a power source and disposed opposed to a sample placed on the sample bench for radiating electromagnetic waves into the vacuum chamber, in which a gas is supplied into the vacuum chamber to generate a plasma and to process the sample with the plasma, the conductive plate member having at least one through hole therein with an opening on a side facing the generated plasma at a position opposed to the sample, at least one through hole having a depth-to-diameter ratio ranging from 5 to 100; an optical transmitter mounted with respect to the vacuum chamber so as to be substantially in contact with a back of the at least one through hole in the conductive plate member, the back of the at least one through hole being disposed opposite to the opening of the at least one through hole in the conductive plate member on the side facing the generated plasma; and means for measuring the light from the sample passing through the at least one through hole by way of the optical transmitter.