Optical Control of Field-Emission Sites by Femtosecond Laser Pulses

Details Optical Control of Field-Emission Sites by Femtosecond Laser Pulses Optical Control of Field-Emission Sites by Femtosecond Laser Pulses

2009-08-24

arxiv.org/abs/0908.3464v2

Phys. Rev. Lett. 103, 257603 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.103.257603

We have investigated field emission patterns from a clean tungsten tip apex induced by femtosecond laser pulses. Strongly asymmetric modulations of the field emission intensity distributions are observed depending on the polarization of the light and the laser incidence direction relative to the azimuthal orientation of tip apex. In effect, we have realized an ultrafast pulsed field-emission source with site selectivity on the 10 nm scale. Simulations of local fields on the tip apex and of electron emission patterns based on photo-excited nonequilibrium electron distributions explain our observations quantitatively.

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