JP5016194B2 - 薄膜ディスクまたはウェハーの光学検査方法 - Google Patents
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Description
表面の単一の走査で薄膜ディスクまたはウェハー上の粒子、ピット、スクラッチ、および汚れを検出・分類する光学検査方法を提供する。光学検査方法は、当該物体の表面に導かれた直角に向いたビームのような入射の異なる面を有する複数の光ビームを使用する。1つの実施形態において、ビームが欠陥に当たったときに生成する散乱光強度は、光ビームの偏光により分離される。別の実施形態において、散乱光強度は光ビームの波長により分離される。分離された散乱光強度は検出器より分離される。ビームの分離された散乱光強度は、欠陥のアスペクト比を判定するために比較される。本方法は、物体表面上のビームスポットの大きさより小さな欠陥を類別することができる。
言い換えると、続く回転は互いに位相が同じであり、平均化した場合には、結果として得られる画像はいかなる微小変動効果によっても不鮮明にならない。平均化は、信号・ノイズ比(S/N比)を向上するために行われる。
正反射信号=(A1+B1+C1+D1)+κ×(A2+B2+C2+D2)
2つの分割ビーム(Cos(ps))間の位相シフトのコサインは、時定数をKを乗じた前記検出器2、つまり808の要素の合計から前記検出器1、つまり808の要素の合計を減算することにより求められる。
Cos(ps)=(A1+B1+C1+D1)−K×(A2+B2+C2+D2)
図8の前記検出器1、つまり809を参照すると、円周方向における傾斜は、下式で与えられる。
円周方向における傾斜={(B1+C1)−(A1+D1)}/(A1+B1+C1+D1)
半径方向における傾斜は、下式で与えられる。
半径方向における傾斜={(A1+B1)−(C1+D1)}/(A1+B1+C1+D1)
Claims (35)
- 回転する物体表面において第1と第2の光ビームのスポットサイズより小さい欠陥を前記表面の単一パス走査で測定する方法であって、
前記物体の円周方向から第1の入射面内にある前記第1の光ビームを前記物体表面上の第1の位置に向けて導き、
前記物体を前記物体の第2の位置へ回転させ、
前記第1の入射面と第2の入射面との角度がゼロに等しくない前記第2の入射面内にある第2の光ビームを、前記物体の半径方向から前記物体表面上の前記第2の位置に向けて導き、
前記物体上の前記第1の位置と前記第2の位置から散乱する光強度を含む前記散乱光ビームを集め、
前記散乱光ビームを前記第1の光ビームに応じる第1の散乱光ビームと前記第2の光ビームに応じる第2の散乱光ビームに分離し、
前記第1の散乱光ビームの第1の振幅を検出し、
前記第2の散乱光ビームの第2の振幅を検出し、
前記第1の散乱光ビームの前記第1の振幅と前記第2の散乱光ビームの前記第2の振幅を比較することにより前記物体表面の前記欠陥のアスペクト比を演算し、
前記アスペクト比に基づいて前記欠陥の種類を判定すること、
を含むことを特徴とする物体表面の欠陥を測定するための方法。 - 前記散乱光強度を前記第1の散乱光ビームと前記第2の散乱光ビームに分離するステップの前に、前記第1の位置と前記第2の位置から前記散乱光強度をコリメートするステップをさらに含むことを特徴とする請求項1に記載の物体表面の欠陥を測定するための方法。
- 前記散乱光強度は楕円鏡で集められることを特徴とする請求項1に記載の物体表面の欠陥を測定するための方法。
- 検出前にピンホールが前記散乱光強度を絞るように使用されることを特徴とする請求項1に記載の物体表面の欠陥を測定するための方法。
- 光電管が第1の散乱光ビーム検出することを特徴とする請求項1に記載の物体表面の欠陥を測定するための方法。
- 光電管が第2の散乱光ビーム検出することを特徴とする請求項1に記載の物体表面の欠陥を測定するための方法。
- 前記第1の光ビームと前記第2の光ビームは偏光された光ビーム含むことを特徴とする請求項1に記載の物体表面の欠陥を測定するための方法。
- 前記第1の光ビームと前記第2の光ビームはP偏光された光ビーム含むことを特徴とする請求項1に記載の物体表面の欠陥を測定するための方法。
- 前記第1の入射面と前記第2の入射面との前記角度は実質的に90°である
ことを特徴とする請求項1に記載の物体表面の欠陥を測定するための方法。 - 偏光ビームスプリッタが前記散乱光強度を分離することを特徴とする請求項1に記載の物体表面の欠陥を測定するための方法。
- 前記第1の散乱光ビームと前記第2の散乱光ビームは偏光された散乱光ビーム含むことを特徴とする請求項1に記載の物体表面の欠陥を測定するための方法。
- 前記第1の散乱光ビームはP偏光され、前記第2の散乱光ビームはS偏光されることを特徴とする請求項11に記載の物体表面の欠陥を測定するための方法。
- 前記第1の光ビームは円周方向に導かれ、前記第2の光ビームは半径方向に導かれることを特徴とする請求項1に記載の物体表面の欠陥を測定するための方法。
- 前記第1の光ビームは前記第1の位置からの散乱光強度を含み、かつ前記第2の光ビームは前記第2の位置からの散乱光強度を含むことを特徴とする請求項13に記載の物体表面の欠陥を測定するための方法。
- 前記第1の光ビームと前記第2の光ビームは異なる波長の光ビームを含むことを特徴とする請求項1に記載の物体表面の欠陥を測定するための方法。
- 2色性の鏡が前記散乱光強度を前記第1の散乱光ビームと前記第2の散乱光ビーム分離することを特徴とする請求項15に記載の物体表面の欠陥を測定するための方法。
- 前記欠陥はスクラッチであることを特徴とする請求項1に記載の物体表面の欠陥を測定するための方法。
- 前記欠陥は粒子であることを特徴とする請求項1に記載の物体表面の欠陥を測定するための方法。
- 回転する物体の両面である第1表面と第2表面において、前記第1表面の第1と第2光ビームおよび前記第2表面の第3と第4光ビームのスポットサイズより小さい前記第1表面と前記第2表面上の欠陥を前記両面の単一パス走査で同時に測定する方法であって、
前記物体の円周方向から第1の入射面内にある前記第1の光ビームを前記物体の前記第1表面上の第1の位置に向けて導き、
前記物体を前記物体の第2の位置へ回転させ、
前記第1の入射面と第2の入射面との角度がゼロに等しくない前記第2の入射面内にある第2の光ビームを、前記物体の半径方向から前記第1表面上の前記第2の位置に向けて導き、
前記物体上の前記第1の位置と前記第2の位置から散乱する光強度を含む前記散乱光ビームを集め、
前記散乱光ビームを前記第1の光ビームに応じる第1の散乱光ビームと前記第2の光ビームに応じる第2の散乱光ビームに分離し、
前記第1の散乱光ビームの第1の振幅を検出し、
前記第2の散乱光ビームの第2の振幅を検出し、
前記第1の散乱光ビームの前記第1の振幅と前記第2の散乱光ビームの前記第2の振幅を比較することにより前記物体の前記第1表面上の前記欠陥の第1のアスペクト比を演算し、
前記第1のアスペクト比に基づいて前記第1表面上の前記欠陥の種類を判定するとともに、
前記物体の前記第2表面では、円周方向から第3の入射面内にある前記第3の光ビームを前記物体の前記第2表面上の第3の位置に向けて導き、
前記物体を前記物体の第3の位置へ回転させ、
前記第3の入射面と第4の入射面との角度がゼロに等しくない前記第4の入射面内にある第4の光ビームを、前記物体の半径方向から前記第2表面上の前記第4の位置に向けて導き、
前記物体上の前記第3の位置と前記第4の位置から散乱する光強度を含む前記散乱光ビームを集め、
前記散乱光ビームを前記第3の光ビームに応じる第3の散乱光ビームと前記第4の光ビームに応じる第4の散乱光ビームに分離し、
前記第3の散乱光ビームの第3の振幅を検出し、
前記第4の散乱光ビームの第4の振幅を検出し、
前記第3の散乱光ビームの前記第3の振幅と前記第4の散乱光ビームの前記第4の振幅を比較することにより前記物体の前記第2表面上の前記欠陥の第2のアスペクト比を演算し、
前記第2のアスペクト比に基づいて前記第2表面上の前記欠陥の種類を判定すること、
を含むことを特徴とする両面物体の前記第1表面と前記第2表面上の欠陥を測定するための方法。 - 前記第1表面の散乱光強度は第1楕円鏡で集められ、前記第2表面の散乱光強度は第2楕円鏡で集められることを特徴とする請求項19に記載の両面物体の前記第1表面と前記第2表面上の欠陥を測定するための方法。
- 第1のピンホールが検出前に前記第1表面の散乱光強度を絞るように使用され、かつ第2のピンホールが検出前に前記第2表面の散乱光強度を絞るように使用されことを特徴とする請求項19に記載の両面物体の前記第1表面と前記第2表面上の欠陥を測定するための方法。
- 前記第1の散乱光ビーム検出器は光電管であることを特徴とする請求項19に記載の両面物体の前記第1表面と前記第2表面上の欠陥を測定するための方法。
- 前記第2の散乱光ビーム検出器は光電管であることを特徴とする請求項19に記載の両面物体の前記第1表面と前記第2表面上の欠陥を測定するための方法。
- 前記第3の散乱光ビーム検出器は光電管であることを特徴とする請求項19に記載の両面物体の前記第1表面と前記第2表面上の欠陥を測定するための方法。
- 前記第4の散乱光ビーム検出器は光電管であることを特徴とする請求項19に記載の両面物体の前記第1表面と前記第2表面上の欠陥を測定するための方法。
- 前記第1の光ビームと前記第2の光ビームと前記第3の光ビームと前記第4の光ビームとは、偏光された光ビームを含むことを特徴とする請求項19に記載の両面物体の前記第1表面と前記第2表面上の欠陥を測定するための方法。
- 前記第1の光ビームと前記第2の光ビームと前記第3の光ビームと前記第4の光ビームとは、P偏光された光ビームを含むことを特徴とする請求項19に記載の両面物体の前記第1表面と前記第2表面上の欠陥を測定するための方法。
- 前記第1の入射面と前記第2の入射面との間の角度は実質的に90°であり、かつ前記第3の入射面と前記第4の入射面との間の角度は実質的に90°であることを特徴とする請求項19に記載の両面物体の前記第1表面と前記第2表面上の欠陥を測定するための方法。
- 第1の偏光ビームスプリッタが前記第1表面散乱光強度を前記第1の散乱光ビームと前記第2の散乱光ビームに分離し、かつ第2の偏光ビームスプリッタが前記第2表面散乱光強度を前記第3の散乱光ビームと前記第4の散乱光ビームに分離することを特徴とする請求項19に記載の両面物体の前記第1表面と前記第2表面上の欠陥を測定するための方法。
- 前記第1の光ビームと前記第3の光ビームとは各々円周方向に導かれ、前記第2の光ビームと前記第4の光ビームとは各々半径方向に導かれることを特徴とする請求項19に記載の両面物体の前記第1表面と前記第2表面上の欠陥を測定するための方法。
- 前記第1の散乱光ビームは前記第1の位置からの散乱光強度を含み、前記第2の散乱光ビームは前記第2の位置からの散乱光強度を含み、前記第3の散乱光ビームは前記第3の位置からの散乱光強度を含み、かつ前記第4の散乱光ビームは前記第4の位置からの散乱光強度を含むことを特徴とする請求項30に記載の両面物体の前記第1表面と前記第2表面上の欠陥を測定するための方法。
- 前記第1の光ビームと前記第2の光ビームとは異なる波長の光ビームを含み、かつ前記第3の光ビームと前記第4の光ビームとは異なる波長の光ビームを含むことを特徴とする請求項19に記載の両面物体の前記第1表面と前記第2表面上の欠陥を測定するための方法。
- 第1の2色性の鏡が前記第1表面の散乱光強度を前記第1の散乱光ビームと前記第2の散乱光ビームに分離し、かつ第2の2色性の鏡が前記第2表面の散乱光強度を前記第3の散乱光ビームと前記第4の散乱光ビームに分離することを特徴とする請求項32に記載の両面物体の前記第1表面と前記第2表面上の欠陥を測定するための方法。
- 前記欠陥はスクラッチであることを特徴とする請求項19に記載の両面物体の前記第1表面と前記第2表面上の欠陥を測定するための方法。
- 前記欠陥は粒子であることを特徴とする請求項19に記載の両面物体の前記第1表面と前記第2表面上の欠陥を測定するための方法。
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2004
- 2004-01-08 US US10/754,275 patent/US7061601B2/en not_active Expired - Fee Related
- 2004-12-03 EP EP04028745A patent/EP1553406B1/en not_active Not-in-force
- 2004-12-03 EP EP10182395A patent/EP2378273A3/en not_active Withdrawn
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2005
- 2005-01-06 JP JP2005001750A patent/JP5016194B2/ja active Active
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR102594832B1 (ko) | 2021-09-15 | 2023-10-27 | 주식회사 싸이너스 | 양면 동시 측정 장치 |
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US20040169850A1 (en) | 2004-09-02 |
US20060152716A1 (en) | 2006-07-13 |
JP2005214966A (ja) | 2005-08-11 |
EP1553406A1 (en) | 2005-07-13 |
EP2378273A3 (en) | 2012-03-14 |
US7061601B2 (en) | 2006-06-13 |
US7190447B2 (en) | 2007-03-13 |
EP2378273A2 (en) | 2011-10-19 |
EP1553406B1 (en) | 2013-02-13 |
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