JP2013504176A - 安定した表面波プラズマソース - Google Patents
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Abstract
【解決手段】表面波プラズマ(surface wave plasma、SWP)ソースが提示される。表面波プラズマソースはプラズマに隣接する電磁気(electromagnetic、EM)波放射部のプラズマ表面上に表面波を発生させて電磁気エネルギを所望する電磁波モードで前記プラズマに結合させるように構成される。電磁波放射部は複数のスロットを備えたスロットアンテナを含む。表面プラズマ(SWP)ソースは前記プラズマ表面に形成される第1リセス配列をさらに含み、前記第1リセス配列は実質的に前記複数のスロットの第1スロット配列に合わせて整列され、前記プラズマ表面に形成される第2リセス配列は前記複数のスロットの第2スロット配列に部分的に合わせて整列されるか、前記複数のスロットの第2スロット配列に合わせて整列されない。
【選択図】図4
Description
一例として、第1リセス配列762は、環状(annular)チャネルを含んでもよく、環状チャネルは第1チャネル深さ及び第1チャネル幅(または第1内側チャネル半径及び第1外側チャネル半径)を特徴とする。図9Aに示すように、第1リセス配列762は、プラズマ表面760の外周エッジ(peripheral edge)に位置する。
必要に応じて、第2の直径は約25mmで約35mmの範囲で指定することができ、板厚と第2の深さとの間の第2階差約10mmから約35mmの範囲で指定してもよい。また、第2の直径は約30mmから約35mmの範囲で指定することができ、第2階差約10mmから約20mmの範囲で指定してもよい。また、第2の直径及び/または第2の深さは板厚の分数であってもよい。
Claims (20)
- プラズマに隣接する電磁気波放射部のプラズマ表面上に表面波を発生させて電磁気エネルギを所望する電磁波モードで前記プラズマに結合させるように構成され、スロットアンテナを含み、前記スロットアンテナは前記スロットアンテナを貫通して形成されて前記電磁気エネルギを前記スロットアンテナ上の第1領域で前記スロットアンテナの下の第2領域に結合させるように構成される複数のスロットを備えた電磁波放射部と、
前記第2領域内に位置して前記電磁波放射部の前記プラズマ表面を含む下面を備える共振板と、
前記プラズマ表面に形成されて実質的に前記複数のスロットの第1スロット配列に合わせて整列する第1リセス配列と、
前記プラズマ表面に形成されて前記複数のスロットの第2スロット配列に部分的に合わせて整列するか、前記複数のスロットの第2スロット配列に合わせて整列されない第2リセス配列と、
前記電磁波放射部に結合されて前記プラズマを形成するために前記電磁気エネルギを前記電磁波放射部に提供するように構成される電力結合システムと、
を含む表面波プラズマソース。 - 前記電力結合システムは、前記電磁気エネルギを前記電磁波放射部に結合させるための同軸フィードを含み、
前記スロットアンテナは、前記同軸フィードの内部導体に結合される一端及び前記同軸フィードの外部導体に結合される他端を含む請求項1に記載の表面波プラズマソース。 - 前記電磁波放射部は、前記第1領域に位置して前記電磁気エネルギの有効波長を自由空間における前記電磁気エネルギの波長と比べて減少するように構成される遅波板をさらに含む請求項1に記載の表面波プラズマソース。
- 前記遅波板及び前記共振板は、本質的に石英または高誘電率物質で構成され、前記高誘電率物質は、4より大きい誘電定数を有する請求項3に記載の表面波プラズマソース。
- 前記電力結合システムは、
2.45GHzでマイクロ波エネルギを生産するように構成されるマイクロ波源と、
前記マイクロ波源の排出口に結合される導波管と、
前記導波管に結合されて前記マイクロ波エネルギが前記マイクロ波源で逆伝搬するのを防止するように構成されるアイソレータと、
前記アイソレータに結合されて前記マイクロ波エネルギを前記同軸フィードに結合させるように構成される同軸コンバータと、
を含み、
前記同軸フィードは前記電磁波放射部にも結合される請求項1に記載の表面波プラズマソース。 - 前記複数のスロットはペアで配列され、前記各スロットのペアは第2スロットに直交方向の第1スロットを含む請求項1に記載の表面波プラズマソース。
- 前記第1リセス配列は、
各リセスが第1深さ及び第1直径を特徴とする第1複数の円筒状のリセス、または
第1棚の深さ及び第1棚の幅を特徴とする第1環状棚、または
第1チャネル深さ、第1内側チャネル半径及び第1外側チャネル半径を特徴とする第1環状チャネル、または
前記第1複数の円筒状のリセス、第1環状棚及び第1環状チャネルの2以上の組合せを含む請求項1に記載の表面波プラズマソース。 - 前記第1リセス配列は、前記プラズマ表面の外側領域の近くに位置する請求項7に記載の表面波プラズマソース。
- 前記第2リセス配列は、
各リセスが第2深さ及び第2直径を特徴とする第2複数の円筒状のリセス、または
第2棚の深さ及び第2棚幅を特徴とする第2環状棚、または
第2チャネル深さ、第2内側チャネル半径及び第2外側チャネル半径を特徴とする第2環状チャネル、または
前記第2複数の円筒状のリセス、第2環状棚及び第2環状チャネルの2以上の組合せを含む請求項7に記載の表面波プラズマソース。 - 前記第2リセス配列は、前記プラズマ表面の内側領域近くに位置する請求項9に記載の表面波プラズマソース。
- 前記共振板は、板の直径及び板厚を有する誘電板を含む請求項9に記載の表面波プラズマソース。
- 前記電磁気エネルギは、前記共振板で電波有効波長(λ)を含み、
前記第1直径は前記有効波長の約半分(λ/2)、
前記第2直径は前記有効波長の約半分(λ/2)であるか、前記有効波長の約1/4((λ/4)、
前記板厚と前記第1深さ、前記第1棚の深さまたは前記第1チャネル深さ間の第一階差は、前記有効波長の約半分(λ/2)であるか、前記有効波長の約1/4(λ/4)であり、
前記板厚と前記第2深さ、前記第2棚の深さまたは前記第2チャネル深さ間の第2階差は、前記有効波長の約半分(λ/2)であるか、前記有効波長の約1/4(λ/4)である請求項11に記載の表面波プラズマソース。 - 前記板厚は、前記有効波長の約半分(λ/2)である請求項12に記載の表面波プラズマソース。
- 前記板厚は約25mmで約45mmの範囲、
前記第1直径は約25mmで約35mmの範囲、
前記第2直径は約25mmで約35mmの範囲、
前記板厚と前記第1深さ、前記第1棚の深さまたは前記第1チャネル深さ間の第一階差は約10mmで約35mmの範囲で、
前記板厚と前記第2深さ、前記第2棚の深さまたは前記第2チャネル深さ間の第2階差は約10mmで約35mmの範囲の請求項11に記載の表面波プラズマソース。 - 前記第2直径は、前記第1直径より小さい請求項11に記載の表面波プラズマソース。
- 前記第1環状棚の底または前記第1環状チャネルの底に形成され、各リセスが第3深さ及び第3直径を特徴とする第3複数の円筒状のリセスをさらに含む請求項11に記載の表面波プラズマソース。
- 前記電磁気エネルギは、前記共振板における電波有効波長(λ)を含み、
前記板厚と前記第3深さとの間の第3階差は、前記有効波長の約1/4(λ/4)である請求項11に記載の表面波プラズマソース。 - 前記プラズマ表面に形成され、どの前記複数のスロットにも合わせて整列されることはなく、各リセスが第3深さ及び第3直径を特徴とする第3リセス配列をさらに含む請求項11に記載の表面波プラズマソース。
- プラズマに隣接する電磁気波放射部のプラズマ表面上に表面波を発生させて電磁気エネルギを工程空間で所望する電磁波モードで前記プラズマに結合させるように構成され、スロットアンテナを含み、前記スロットアンテナは前記スロットアンテナを貫通して形成されて前記電磁気エネルギを前記スロットアンテナ上の第1領域で前記スロットアンテナの下の第2領域に結合させるように構成される複数のスロット及び前記第2領域内に位置して前記電磁波放射部の前記プラズマ表面を含む下面(lower surface of resonator plate)を備える共振板を備える電磁波放射部と、
前記プラズマ表面に形成されて実質的に前記複数のスロットの第1スロット配列に合わせて整列する第1リセス配列と、
前記工程空間内の約2mtorrから約1torrの圧力範囲下で前記プラズマを安定化させ、前記共振板の前記プラズマ表面に形成される前記プラズマを安定化させる手段と、
前記工程空間で前記プラズマを均一に発生させるための手段と、
前記電磁波放射部に結合されて前記プラズマを形成するために前記電磁気エネルギを前記電磁波放射部に提供するように構成される電力結合システムと、
を含む表面波プラズマソース。 - プラズマに隣接する電磁気波放射部のプラズマ表面上に表面波を発生させて電磁気エネルギを所望する電磁波モードで前記プラズマに結合させるように構成され、実質的に円形の幾何形状を有するスロットアンテナを含み、前記スロットアンテナは前記スロットアンテナを貫通して形成されて前記電磁気エネルギを前記スロットアンテナ上の第1領域で前記スロットアンテナの下の第2領域に結合させるように構成される複数のスロットを備え、前記複数のスロットは前記スロットアンテナの外周領域に位置する第1複数のスロット及び前記スロットアンテナの中央及び/または中間放射領域に位置する第2複数のスロットを含む電磁波放射部と、
前記第2領域内に位置して前記電磁波放射部の前記プラズマ表面を含む下面を備える共振板と、
前記プラズマ表面に形成されて実質的に前記第1複数のスロットに合わせて整列する第1リセス配列と、
前記プラズマ表面に形成されて前記第2複数のスロットに完全に合わせて整列されるか、前記第2複数のスロットに部分的に合わせて整列されるか、前記第2複数のスロットに合わせて整列されない第2リセス配列と、
前記電磁波放射部に結合されて前記プラズマを形成するために前記電磁気エネルギを前記電磁波放射部に提供するように構成される電力結合システムと、
を含む表面波プラズマソース。
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US8669705B2 (en) | 2014-03-11 |
US20110057562A1 (en) | 2011-03-10 |
CN102597305B (zh) | 2014-09-17 |
US8415884B2 (en) | 2013-04-09 |
KR101688679B1 (ko) | 2016-12-21 |
JP5750107B2 (ja) | 2015-07-15 |
WO2011031571A1 (en) | 2011-03-17 |
CN102597305A (zh) | 2012-07-18 |
US20130264938A1 (en) | 2013-10-10 |
TW201134316A (en) | 2011-10-01 |
KR20120091063A (ko) | 2012-08-17 |
TWI461114B (zh) | 2014-11-11 |
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