Abstract
We study electron emission from a Schottky tip induced by nanosecond laser pulses. Prompt sub-nanosecond emission is observed at low laser power, with moderate voltage bias applied to the tip. We show that electron pulses demonstrate high extinction with electron emission after the pulse suppressed by up to 92 dB. Photoemission is shown to be highly nonlinear with laser intensity while maintaining nearly linear field emission, as probed by the laser polarization dependence. We suggest the emission is described by a photo-assisted thermally enhanced field emission process.
Highlights
Recently, Schottky emitter laser triggering has been demonstrated in the femtosecond[15–18] and the microsecond[19] regimes
We study electron emission from a Schottky tip induced by nanosecond laser pulses
We show that electron pulses demonstrate high extinction with electron emission after the pulse suppressed by up to 92 dB
Summary
Schottky emitter laser triggering has been demonstrated in the femtosecond[15–18] and the microsecond[19] regimes. We study the temporal profile of the generated pulses by electron counting in the single-electron-per-pulse regime, as well as their dependence on dc bias voltage, laser intensity, and polarization.
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