Abstract
Multi-walled carbon nanotubes (MWCNT) have been known to function as nano-biprism in projection microscope. Here we measure the transverse coherence length (Lt) of electron beam (e-beam) from tungsten field emitter by using the nano-biprism. A MWCNT is irradiated by an e-beam radially propagating from a field emitter and its magnified image is projected on the screen. Tip approach enlarges the image and beautiful interference patterns always show up as shown in Fig.1 and Fig.2. With decreasing the source temperature from RT to 78K, the visibility of the interference fringe increases by a factor of 3, and the band width of interference pattern widens by a factor of 5. This enhancement of coherence with temperature fall strongly suggests the direct relationship between the coherences of electronic state1 inside the field emitter and e-beam. Now we are preparing experiments at liquid helium temperature with conventional tungsten tips and superconducting niobium tips, which will provide further enhancement of the coherence of e-beam.
| Original language | English |
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| Title of host publication | IVESC2004 - 5th International Vacuum Electron Sources Conference Proceedings |
| Pages | 283 |
| Number of pages | 1 |
| Publication status | Published - 2004 |
| Event | IVESC2004 - 5th International Vacuum Electron Sources Conference Proceedings - Beijing Duration: 2004 Sept 6 → 2004 Sept 10 |
Other
| Other | IVESC2004 - 5th International Vacuum Electron Sources Conference Proceedings |
|---|---|
| City | Beijing |
| Period | 04/9/6 → 04/9/10 |
ASJC Scopus subject areas
- Engineering(all)