We present energy-resolved measurements of electron emission from sharp metal tips driven with low energy pulses from a few-cycle laser oscillator. We observe above-threshold photoemission with a photon order of up to 9. At a laser intensity of ~2×10¹¹ W/cm² the suppression of the lowest order peak occurs, indicating the onset of strong-field effects. We also observe peak shifting linearly with intensity, with a slope of around -1.0 eV/(10¹² W/cm²). We attribute the magnitude of the laser field effects to field enhancement taking place at the tip's surface.
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Schenk et al. (2010) studied this question.
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