20 September 2011 Attosecond physics with a laser oscillator enabled by field enhancement at a nanoscale metal tip
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Abstract
With electrons laser-emitted from a nanoscale tungsten tip by few-cycle Titanium:sapphire oscillator pulses we demonstrate that we have reached the attosecond science regime, meaning that the electronic motion is controlled by the optical electric field of the laser pulses. We observe coherent elastic re-scattering at the parent tip as well as interference of the electronic wavefunction if it is emitted in two emission windows spaced by one optical period. Controlled by the carrier-envelope phase of the laser pulses, we can continuously tune between a single and two emission windows in time. All this is facilitated by field enhancement taking place at the tip's apex. From our results we obtain a field enhancement factor of 3...6, depending on experimental conditions and on experimental signatures.
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M. Krüger, M. Krüger, M. Schenk, M. Schenk, P. Hommelhoff, P. Hommelhoff, } "Attosecond physics with a laser oscillator enabled by field enhancement at a nanoscale metal tip", Proc. SPIE 8096, Plasmonics: Metallic Nanostructures and Their Optical Properties IX, 80960U (20 September 2011); doi: 10.1117/12.892454; https://doi.org/10.1117/12.892454
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