Plasma processing apparatus
First Claim
1. A plasma processing apparatus for turning a gas supplied to a vacuum reactor into plasma and etching a surface of a sample to be processed placed in the vacuum reactor by the plasma, the apparatus comprising:
- a vacuum reactor;
a vacuum evacuation means for evacuating the interior of the vacuum reactor;
a sample stage means disposed in the vacuum reactor for placing a sample to be processed;
a material gas introducing means for introducing material gas into the vacuum reactor;
a plasma generating means for turning the gas introduced via the material gas introducing means into plasma; and
a plasma emission detecting means disposed at a plane opposing to the sample to be processed, wherein the plasma emission detecting means further comprises;
an emission extraction means for extracting the emission from plasma;
a light transmission means located outside of the vacuum reactor for scattering and transmitting incident light into the emission extraction means; and
a vacuum partition window configured to prevent the light transmission means from being directly exposed to the plasma,wherein the light transmission means of the plasma emission detecting means is comprised of a light scattering means having an uneven surface of Ra 5 μ
m or greater and Ra 200 μ
m or smaller, for scattering and transmitting incident light of 0.2 μ
m or greater in wavelength;
wherein the uneven surface of the light scattering means is obtained by applying an abrasive to the surface of the light scattering means.
1 Assignment
0 Petitions
Accused Products
Abstract
An arrangement is provided for suppressing interference phenomenon on the surface of a sample that deteriorates the detection accuracy upon detecting the time variation of plasma conditions such as plasma space distribution or the processing status of the sample. For example, light scattering element for diffusing and transmitting incident light and a convex lens are arranged on a front stage of an optical fiber light receiving unit connected to a photodetector disposed on an opposite side from the sample for observing the emission of plasma. This serves to prevent the changes in light quantity accompanying the interference effect caused by the changes in thin film thickness on the surface of the sample from reaching the photodetector. An arrangement is also provided to prevent the light scattering element from being directly exposed to the plasma to prevent alteration of the light scattering element.
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Citations
21 Claims
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1. A plasma processing apparatus for turning a gas supplied to a vacuum reactor into plasma and etching a surface of a sample to be processed placed in the vacuum reactor by the plasma, the apparatus comprising:
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a vacuum reactor; a vacuum evacuation means for evacuating the interior of the vacuum reactor; a sample stage means disposed in the vacuum reactor for placing a sample to be processed; a material gas introducing means for introducing material gas into the vacuum reactor; a plasma generating means for turning the gas introduced via the material gas introducing means into plasma; and a plasma emission detecting means disposed at a plane opposing to the sample to be processed, wherein the plasma emission detecting means further comprises; an emission extraction means for extracting the emission from plasma; a light transmission means located outside of the vacuum reactor for scattering and transmitting incident light into the emission extraction means; and a vacuum partition window configured to prevent the light transmission means from being directly exposed to the plasma, wherein the light transmission means of the plasma emission detecting means is comprised of a light scattering means having an uneven surface of Ra 5 μ
m or greater and Ra 200 μ
m or smaller, for scattering and transmitting incident light of 0.2 μ
m or greater in wavelength;
wherein the uneven surface of the light scattering means is obtained by applying an abrasive to the surface of the light scattering means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A plasma processing apparatus for turning a gas supplied to a vacuum reactor into plasma and etching a surface of a sample to be processed placed in the vacuum reactor by the plasma, the apparatus comprising:
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a vacuum reactor; an vacuum evacuation means for evacuating the interior of the vacuum reactor; a sample stage means disposed in the vacuum reactor for placing a sample to be processed; a material gas introducing means for introducing material gas into the vacuum reactor; a plasma generating means for turning the gas introduced via the material gas introducing means into plasma; and a plasma emission detecting means disposed at a plane opposing to the sample to be processed, wherein the plasma emission detecting means further comprises; an emission extraction means for extracting the emission from plasma; a light transmission means located outside of the vacuum reactor for scattering and transmitting incident light into the emission extraction means; and means for preventing the light transmission means from being altered by the plasma by preventing the light transmission means from being directly exposed to the plasma, wherein the light transmission means of the plasma emission detecting means is comprised of a light scattering means having an uneven surface of Ra 5 μ
m or greater and Ra 200 μ
m or smaller, for scattering and transmitting incident light of 0.2 μ
m or greater in wavelength;
wherein the uneven surface of the light scattering means is obtained by applying an abrasive to the surface of the light scattering means. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification