An Ultrafast Source of Electron Pulses Triggered by a Surface Plasmon |
| TYPE | Special Seminar - Solid State Institute, Technion |
| Speaker: | Mr. Avraham Eitan |
| Affiliation: | Department of Physics and the Solid State Institute Technion |
| Date: | 27.07.2021 |
| Time: | 12:30 - 13:30 |
| Location: | Solid State Auditorium(Entrance) |
| Remark: | M.Sc. Student of Assistant Professor Michael Krueger |
| Presentation: |  |
| Abstract: | The Special Seminar by Avraham Eitan tomorrow will be in person and also on ZOOM: https://technion.zoom.us/j/93805998054 *Refreshment (Pizzot) at 12:15.
Ultrafast electron dynamics in nanostructures takes place on the femtosecond and picosecond time scales. Electron holography is an excellent pathway to image charges distributions in space with nanometer resolution. In order to achieve time resolution, a pulsed point source of electrons is required. Here we designed and characterized a low-energy pulsed electron point source triggered by surface plasmons. It is based on a gold nanotip with a single groove that couples ultrashort laser pulses (5fs duration) to the shank of the tip. This coupling causes a plasmon to travel to the sharp apex of the tip and emit a pulsed electron wavepacket. We observe multiphoton photoemission from the tip and also find signatures of light-induced tunneling for the first time. Our source is suitable for imaging ultrafast quantum dynamics with sub-10fs resolution.
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