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We present a comprehensive experimental and numerical study of photoelectronstreaking at metallic nanotips using single-cycle Terahertz (THz) transientsand a static bias voltage as an external control parameter. Analyzing biasvoltage dependent streaking spectrograms, we explore the THz-induced reshapingof photoelectron energy spectra, governed by the superimposed static field.Numerical simulations are employed to determine the local field strengths andspatial decay lengths of the field contributions, demonstrating electrontrajectory control and the manipulation of the phase space distributions inconfined fields with both dynamic and static components.

Phase space manipulation of free-electron pulses from metal nanotips using combined THz near-fields and external biasing