Patent ID: 7018506

Claim:
A plasma processing apparatus, comprising: a vacuum chamber in which a workpiece to be processed can be arranged; a first plate, which forms an upper part of the vacuum chamber and comprises a first nonmagnetic metal body that has a first opening and a first dielectric material member that seals the first opening, wherein the area of the first nonmagnetic metal body is larger than the area of the first dielectric material member; a high frequency induction antenna, which is disposed outside the vacuum chamber and arranged over the first plate; and a second plate spaced from and facing the first plate, comprising a second nonmagnetic metal body that has a second opening and a second dielectric material member that seals the second opening; wherein the area of the second nonmagnetic metal body is larger than the area of said second dielectric material member; and wherein the second nonmagnetic metal body includes a plurality of holes, so that the second plate forms a showerhead with the first plate.