Patent ID: 9543121
Date: 2017-01-10
CPC Classifications: H01J

Claim:
1. An inductively coupled plasma processing apparatus for performing plasma processing on a substrate by generating an inductively coupled plasma in a plasma generation region in a processing chamber, the apparatus comprising: a high frequency antenna configured to generate the inductively coupled plasma in the plasma generation region, the high frequency antenna being divided into at least one inner high frequency antenna having a first closed loop and an outer high frequency antenna having a second closed loop that concentrically surrounds the first closed loop of the inner high frequency antenna; and a metal window provided between the plasma generation region and the high frequency antenna such that the metal window is disposed directly below the high frequency antenna, wherein the metal window is divided into multiple sections based on a first division scheme and a second division scheme, the first division scheme divides the metal window along at least one boundary that is between the inner high frequency antenna and the outer high frequency antenna such that the metal window is divided into at least a first portion, that is overlapped by the first closed loop of the inner high frequency antenna while not being overlapped by the second closed loop of the outer high frequency antenna, and a second portion, that is overlapped by the second closed loop of the outer high frequency antenna while not being overlapped by the first closed loop of the inner high frequency antenna, the first and second portions being electrically insulated from each other and the second division scheme further divides the entire metal window into multiple portions that increase in width moving outward from a center portion of the metal window based on boundaries which cross from the center portion of the metal window to an outermost perimeter of the metal window, the multiple portions demarcated by the second division scheme being electrically insulated from each other.