Patent ID: 9691591
Date: 2017-06-27
CPC Classifications: H01J

Claim:
1. A plasma processing apparatus, comprising: a processing chamber that can be evacuated to a vacuum state; a processing gas supplying unit configured to supply a processing gas to the processing chamber; a microwave supplying unit configured to supply microwave to the processing chamber in order to produce plasma of the processing gas; an electrode configured to hold a substrate to be processed so as to be exposed to the plasma in the processing chamber; a high frequency power supplying unit configured to apply high frequency wave for RF bias via a power feeding rod having a cylindrical shape; an external conductor that encloses a periphery of the power feeding rod; and a choke mechanism installed on an outer peripheral surface of the power feeding rod and disposed in a coaxial line formed between the outer peripheral surface of the power feeding rod and an inner peripheral surface of the external conductor, and the choke mechanism configured as a low-pass filter that allows the high frequency wave for RF bias to pass through a surface of the power feeding rod and blocks a coaxial space propagation of the microwave introduced from the microwave supplying unit propagating through a processing space provided above a susceptor serving as an RF electrode into a space of the coaxial line via an opening provided at a bottom portion of the processing chamber for the choke mechanism, the microwave supplying unit being disposed above the susceptor.