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ID 51053
本文ファイル
著者
Nishida, Munehiro 大学院先進理工系科学研究科 広大研究者総覧
Matsumoto, Taisei
Koga, Hiroya
Kosako, Terukazu
Kadoya, Yutaka 大学院先進理工系科学研究科 広大研究者総覧
抄録(英)
Attenuated total reflection (ATR) by surface plasmon polariton (SPP) is a method for evaluating the dispersion relation of SPP from the position of a dip in the reflection spectrum. However, recent studies have shown that the dips are displaced from SPP resonance because they are produced by a type of Fano resonance, i.e., the interference between the resonant reflection process accompanied by resonant excitation of SPP and the direct reflection process without resonant excitation. This result suggests that the system properties difficult to be achieved in the dispersion relation of SPP can be characterized using the ATR method. In this study, we investigate the effect of surface roughness due to nanosized dimples created in the initial stage of pitting corrosion on the ATR spectrum, from the viewpoint of Fano resonance. Using the temporal coupled-mode method, it is shown that the Fano resonance in ATR is caused by the phase change of direct reflection because of the absorption on the metal surface, and the spectral shape is determined by this phase, along with the ratio of the external (radiative) decay rate to the total decay rate of the resonant mode. Moreover, it is clarified that the internal and external decay rates extracted from the ATR spectrum provide information on corrosion, such as the effective thickness of the metal film and the randomness in dimple distribution.
内容記述
This study was supported by JSPS KAKENHI Grants No. JP18K04980 and No. JP18K04979.
掲載誌名
Physical Review B
101巻
8号
開始ページ
085414-1
終了ページ
085414-11
出版年月日
2020-02-20
出版者
American Physical Society
ISSN
2469-9950
2469-9969
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
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application/pdf
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権利情報
© 2020 American Physical Society
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部局名
先進理工系科学研究科