We demonstrate plasmon mapping of Ag nanostructures on graphite using scanning probe energy loss spectroscopy (SPELS) with a spatial resolution of 100 nm. In SPELS, an STM tip is used as a localized source of field-emitted electrons to probe the sample surface. The energy loss spectrum of the backscattered electrons is measured to provide a chemical signature of the surface under the tip. We acquire three images simultaneously with SPELS: i) constant-current field-emission images, which provide topographical information; ii) backscattered electron images, which display material contrast; and iii) SPELS images, where material-dependent features such as plasmons are mapped.
|Journal||Applied Physics Express|
|Publication status||Published - 13 Nov 2015|
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- Department of Physics - Senior Lecturer
- Centre for Nanoscience and Nanotechnology
- Condensed Matter Physics CDT
- The Bath Physics Observatory (BPO)
Person: Research & Teaching