Endpoint detecting apparatus in a plasma etching system
First Claim
1. A system for detecting an endpoint in a plasma etching system having a plasma reaction chamber, said system comprising:
- a detection window provided at a wall of said reaction chamber, said detection window protruding outwardly from said reaction chamber wall;
a detecting apparatus disposed separately from said reaction chamber;
an optical cable for transmitting light to said detecting apparatus, said light being generated during an etching process and transmitted through said detection window to said optical cable;
a bracket for fixedly holding said detection window and said optical cable with respect to each other, said bracket being attached to an outer surface of said wall; and
means, externally arranged to said reaction chamber, for reducing intensity of an electric field formed between the bracket and said reaction chamber.
1 Assignment
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Accused Products
Abstract
An apparatus used for detecting the endpoint or described completion point of an etching process has a detection window, an optical cable, and a bracket for fixedly holding the detection window and the optical cable with respect to each other. The detection window protrudes outwardly from a wall of a reaction chamber. The optical cable transmits light generated during an etching process from the detection window to a detecting device separate from the detection chamber. The bracket is attached to the wall of the reaction chamber so as to configure a space between the bracket and the detection window. The configuration reduces the intensity of the electric field formed between the bracket and plasma in the reaction chamber.
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Citations
7 Claims
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1. A system for detecting an endpoint in a plasma etching system having a plasma reaction chamber, said system comprising:
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a detection window provided at a wall of said reaction chamber, said detection window protruding outwardly from said reaction chamber wall; a detecting apparatus disposed separately from said reaction chamber; an optical cable for transmitting light to said detecting apparatus, said light being generated during an etching process and transmitted through said detection window to said optical cable; a bracket for fixedly holding said detection window and said optical cable with respect to each other, said bracket being attached to an outer surface of said wall; and means, externally arranged to said reaction chamber, for reducing intensity of an electric field formed between the bracket and said reaction chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification