Ultrafast electron pulses from a tungsten tip triggered by low-power femtosecond laser pulses.

We present an experimental and numerical study of electron emission from a sharp tungsten tip triggered by sub-8-fs low-power laser pulses. This process is nonlinear in the laser electric field, and the nonlinearity can be tuned via the dc voltage applied to the tip. Numerical simulations of this system show that electron emission takes place within less than one optical period of the exciting laser pulse, so that an 8 fs 800 nm laser pulse is capable of producing a single electron pulse of less than 1 fs duration. Furthermore, we find that the carrier-envelope phase dependence of the emission process is smaller than 0.1% for an 8 fs pulse but is steeply increasing with decreasing laser pulse duration.

[1]  R. Byer,et al.  Visible-laser acceleration of relativistic electrons in a semi-infinite vacuum. , 2005, Physical review letters.

[2]  A. Baltuska,et al.  Measurement of the phase of few-cycle laser pulses. , 2003 .

[3]  S. Harris,et al.  Generation of a single-cycle optical pulse , 2004, Conference on Lasers and Electro-Optics, 2004. (CLEO)..

[4]  F. Krausz,et al.  Measurement of interferometric autocorrelations: comment. , 1997, Applied optics.

[5]  T. Fortier,et al.  Carrier-envelope phase-controlled quantum interference of injected photocurrents in semiconductors. , 2004, Physical review letters.

[6]  R. M. More,et al.  Femtosecond thermionic emission from metals in the space-charge-limited regime , 1993 .

[7]  J Burgdörfer,et al.  Observation of light-phase-sensitive photoemission from a metal. , 2004, Physical review letters.

[8]  P. Renucci,et al.  Probing carrier dynamics in nanostructures by picosecond cathodoluminescence , 2005, Nature.

[9]  X. Lin.  Photonic band gap fiber accelerator , 2001 .

[10]  Hendrik F. Hamann,et al.  Strength of the electric field in apertureless near-field optical microscopy , 2001 .

[11]  B. Cowan.  Two-dimensional photonic crystal accelerator structures , 2003 .

[12]  H. Ishida,et al.  First-principles calculation of field emission from metal surfaces , 2003 .

[13]  Jason R. Dwyer,et al.  An Atomic-Level View of Melting Using Femtosecond Electron Diffraction , 2003, Science.

[14]  V. Lobastov,et al.  Four-dimensional ultrafast electron microscopy. , 2005, Proceedings of the National Academy of Sciences of the United States of America.

[15]  Self-Referenced 200 MHz Octave-Spanning Ti:Sapphire Laser with 50 Attosecond Carrier-Envelope Phase Jitter. , 2005, Optics express.

[16]  Peter Hommelhoff,et al.  Field emission tip as a nanometer source of free electron femtosecond pulses. , 2006, Physical review letters.

[17]  S. Purcell,et al.  Electron Field Emission from Atom-Sources: Fabrication, Properties, and Applications of Nanotips , 1996 .

[18]  H Ihee,et al.  Direct imaging of transient molecular structures with ultrafast diffraction. , 2001, Science.

[19]  Thomas Udem,et al.  Monolithic carrier-envelope phase-stabilization scheme. , 2005, Optics letters.

[20]  A Poppe,et al.  Route to phase control of ultrashort light pulses. , 1996, Optics letters.

[21]  D Sertore,et al.  Generation of GW radiation pulses from a VUV free-electron laser operating in the femtosecond regime. , 2002, Physical review letters.

[22]  W. King,et al.  Ultrafast electron microscopy in materials science, biology, and chemistry , 2005 .

[23]  F. Légaré,et al.  Sub-laser-cycle electron pulses for probing molecular dynamics , 2002, Nature.

[24]  Knight,et al.  Optical frequency synthesizer for precision spectroscopy , 2000, Physical review letters.