Patent ID: 8298371

Claim:
A plasma processing apparatus comprising: an evacuable processing chamber; a main lower electrode to support a target substrate in the processing chamber; a peripheral lower electrode extending in a ring shape to surround an outer periphery of the main lower electrode, the peripheral lower electrode being electrically insulated from the main lower electrode; a focus ring attached to cover a top surface of the peripheral lower electrode; an upper electrode disposed above the main lower electrode and the peripheral lower electrode to face thereto; a processing gas supply unit to supply a processing gas to a processing space formed between the main lower electrode and the upper electrode; a first high frequency power supply unit connected to the main lower electrode and the peripheral lower electrode via a matching unit to apply a first high frequency power having a first frequency; a second high frequency power supply unit connected to the main lower electrode and the peripheral lower electrode via the matching unit to apply a second high frequency power having a second frequency lower than the first frequency; and a filter, connected between the second high frequency power supply unit and the peripheral lower electrode, to pass the first high frequency power while blocking the second high frequency power.