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PLASMA ETCHING APPARATUS AND PLASMA ETCHING METHOD

  • US 20120132617A1
  • Filed: 08/05/2010
  • Published: 05/31/2012
  • Est. Priority Date: 08/06/2009
  • Status: Abandoned Application
First Claim
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1. A plasma etching apparatus, comprising:

  • a processing container capable of maintaining an atmosphere depressurized below atmospheric pressure;

    a depressurization unit configured to depressurize an interior of the processing container to a prescribed pressure;

    a placement unit provided in the interior of the processing container, the placement unit being configured to place a processing object;

    a discharge tube provided at a position isolated from the processing container, the discharge tube having a region in an interior of the discharge tube used to generate plasma;

    an introduction waveguide tube configured to cause microwaves radiated from a microwave production unit to propagate to introduce the microwaves to the region used to generate the plasma;

    a gas supply unit configured to supply a process gas to the region used to generate the plasma;

    a transport tube configured to link the discharge tube to the processing container;

    a detection window provided in a wall surface of the processing container, the detection window being configured to transmit light;

    a coherent light detection unit including a plurality of light receiving devices in a light reception surface configured to receive coherent light emitted from a surface of a processing object placed in the placement unit; and

    a control unit configured to detect an end point of etching based on an output from the coherent light detection unit,the control unit being configured to use an output from the light receiving devices of a detection region of the coherent light detection unit to extract an output of the light receiving device of a portion of the detection region corresponding to an etching portion to detect the end point of the etching based on an intensity of the coherent light determined from the output of the light receiving device of the portion of the detection region corresponding to the etching portion.

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