Patent ID: 8197634
Filing Date: 2012-06-12
Classification: H01J

Abstract:
1. A plasma processing apparatus for turning a gas supplied to a vacuum reactor into plasma and etching a surface of a sample to be processed placed in the vacuum reactor by the plasma, the apparatus comprising: a vacuum reactor; a vacuum evacuation means for evacuating the interior of the vacuum reactor; a sample stage means disposed in the vacuum reactor for placing a sample to be processed; a material gas introducing means for introducing material gas into the vacuum reactor; a plasma generating means for turning the gas introduced via the material gas introducing means into plasma; and a plasma emission detecting means disposed at a plane opposing to the sample to be processed, wherein the plasma emission detecting means further comprises; wherein the light transmission means of the plasma emission detecting means is comprised of a light scattering means having an uneven surface of Ra 5 μm or greater and Ra 200 μm or smaller, for scattering and transmitting incident light of 0.2 μm or greater in wavelength; wherein the uneven surface of the light scattering means is obtained by applying an abrasive to the surface of the light scattering means.