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説明:

A surface plasmon energy gain for emitted secondary electrons (SEs) was recently observed in SE spectroscopy measurements from a tailor-made nanostructured Au specimen as a satellite on the high energy side of the vacuum level. However, thus far, this plasmon energy gain phenomenon has been observed only for Au samples because surface plasmons in Au arise at 2.3 eV, which is relatively far from the strong background cascade peak of SEs. Here, we report a brand-new three-point probe method, for enlarging the surface plasmon energy gain structure in SE spectra. Using this scheme, three different SE energy spectra were measured from nanostructured samples of Au and Ag. By combining their spectra, the surface plasmon energy gain structure of Au and Ag can be clearly observed. The observed structures revealed that the plasmon energy gain process for SEs contributing to a potentially observable feature in a spectrum occurs only in vacuum above the sample surface and is naturally related only to surface plasmons. This unusual plasmon energy gain phenomenon observed by the three-point probe method suggests the potential for development of a new physical image directly in space based on surface plasmons in vacuum above the surface of a medium.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: surface plasmon energy gain, secondary electron

刊行年月日: 2022-05-10

出版者: Elsevier BV

掲載誌:

• APPLIED SURFACE SCIENCE (ISSN: 01694332) vol. 596 p. 153616-153616

研究助成金:

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4214

公開URL: https://doi.org/10.1016/j.apsusc.2022.153616

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更新時刻: 2024-05-11 08:30:20 +0900

MDRでの公開時刻: 2024-05-11 08:30:20 +0900