Space charge corrected electron emission from an aluminum surface under non-equilibrium conditions

A theoretical study has been conducted of ultrashort pulsed laser induced electron emission from an aluminum surface. Electron emission fluxes retrieved from the commonly employed Fowler-DuBridge theory were compared to fluxes based on a laser-induced non-equilibrium electron distribution. As a result, the two- and three-photon photoelectron emission parameters for the Fowler-DuBridge theory have been approximated. We observe that at regimes where photoemission is important, laser-induced electron emission evolves in a more smooth manner than predicted by the Fowler-DuBridge theory. The importance of the actual electron distribution decreases at higher laser fluences, whereas the contribution of thermionic emission increases. Furthermore, the influence of a space charge effect on electron emission was evaluated by a one dimensional particle-in-cell model. Depending on the fluences, the space charge reduces the electron emission by several orders of magnitude. The influence of the electron emission flux pr...

[1]  K. Jensen,et al.  Photoemission Theory and the Development of High Performance Photocathodes , 2009 .

[2]  Experimental time-resolved photoemission and ab initio study of lifetimes of excited electrons in Mo and Rh , 2006, cond-mat/0604067.

[3]  S. Mao,et al.  Femtosecond laser-induced electronic plasma at metal surface , 2008 .

[4]  E. Logothetis,et al.  Three-Photon Photoelectric Effect in Gold , 1967 .

[5]  M. Cinchetti,et al.  Driving force of ultrafast magnetization dynamics , 2011, 1108.5170.

[6]  Andrew M. Weiner,et al.  High‐speed electrical sampling by fs photoemission , 1986 .

[7]  E. Campbell,et al.  Surface charging and impulsive ion ejection during ultrashort pulsed laser ablation. , 2002, Physical review letters.

[8]  Storz,et al.  Electron thermalization in gold. , 1992, Physical review. B, Condensed matter.

[9]  B. Luther-Davies,et al.  Ablation of solids by femtosecond lasers: ablation mechanism and ablation thresholds for metals and dielectrics , 2002 .

[10]  Wolf,et al.  Ultrafast electron dynamics at Cu(111): Response of an electron gas to optical excitation. , 1996, Physical review letters.

[11]  Response theory for time-resolved second-harmonic generation and two-photon photoemission , 2001, cond-mat/0102493.

[12]  S. H. Kong,et al.  Photocathodes for free electron lasers , 1995 .

[14]  E. M. Logothetis,et al.  Laser-Induced Electron Emission from Solids: Many-Photon Photoelectric Effects and Thermionic Emission , 1969 .

[15]  Leonid V. Zhigilei,et al.  Combined atomistic-continuum modeling of short-pulse laser melting and disintegration of metal films , 2003 .

[16]  S. Anisimov,et al.  Intensity dependence of a laser-initiated emission current from a metal surface , 1976 .

[17]  Girardeau-Montaut Theory of ultrashort nonlinear multiphoton photoelectric emission from metals. , 1995, Physical review. B, Condensed matter.

[18]  K. Jensen,et al.  Application of a general electron emission equation to surface non-uniformity and current density variation , 2007, 2007 IEEE 20th International Vacuum Nanoelectronics Conference.

[19]  B. Fernández,et al.  Direct analysis of solid samples by fs-LA-ICP-MS , 2007 .

[20]  A Ostendorf,et al.  Sub-diffraction limited structuring of solid targets with femtosecond laser pulses. , 2000, Optics express.

[21]  Sun,et al.  Femtosecond-tunable measurement of electron thermalization in gold. , 1994, Physical review. B, Condensed matter.

[22]  M. Aeschlimann,et al.  Dynamics of excited electrons in metals, thin films and nanostructures , 2002 .

[23]  K. Jensen,et al.  A theoretical photocathode emittance model including temperature and field effects , 2007, IEEE Symposium on Privacy-Aware Computing.

[24]  J. H. Bechtel,et al.  Two-photon photoemission from metals induced by picosecond laser pulses , 1977 .

[25]  H. Ueba,et al.  Theory of two-photon photoemission spectroscopy of surfaces , 2007 .

[26]  I. Bray,et al.  Ultrafast electron dynamics in metals under laser irradiation , 1999 .

[27]  A. Bogaerts,et al.  Space charge limited electron emission from a Cu surface under ultrashort pulsed laser irradiation , 2010 .

[28]  L. Lim,et al.  Femtosecond laser ablation of thin films for the fabrication of binary photomasks , 2002 .

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

[30]  M. Vičánek,et al.  Ultrafast dynamics of nonequilibrium electrons in metals under femtosecond laser irradiation , 2002 .

[31]  E. Campbell,et al.  Electronic transport and consequences for material removal in ultrafast pulsed laser ablation of materials , 2004 .

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

[33]  V. Zhukov,et al.  Lifetimes of excited electrons in Ta: Experimental time-resolved photoemission data and first-principles GW + T theory , 2004 .

[34]  J. Hohlfeld,et al.  Time-resolved thermoreflectivity of thin gold films and its dependence on film thickness , 1997 .

[35]  G. Raşeev,et al.  NONEQUILIBRIUM ELECTRON DISTRIBUTION IN METALS , 1997 .

[36]  G. Kubiak,et al.  Intense surface photoemission : space charge effects and self-acceleration , 1990 .

[37]  Jean-Pierre Girardeau-Montaut,et al.  Scaling law for temporal dispersion of a short electron pulse across a diode in space‐charge regime , 1989 .

[38]  M. Sakaue,et al.  Effects of hole scattering on two-photon photoemission from metal surfaces , 2003 .

[39]  R. Fowler,et al.  The Analysis of Photoelectric Sensitivity Curves for Clean Metals at Various Temperatures , 1931 .

[40]  Girardeau-Montaut Space-charge effect on the energy spectrum of photoelectrons produced by high-intensity short-duration laser pulses on a metal. , 1991, Physical review. A, Atomic, molecular, and optical physics.

[41]  S. Nikumb,et al.  A study of balancing the competing effects of ultrashort laser induced plasma for optimal laser machining , 2007 .

[42]  James G. Fujimoto,et al.  Femtosecond Laser Interaction with Metallic Tungsten and Nonequilibrium Electron and Lattice Temperatures , 1984, Topical Meeting on Ultrafast Phenomena.

[43]  F. Parmigiani,et al.  Non-linear electron photoemission from metals with ultrashort pulses , 2009 .

[44]  Bulgakov,et al.  Double layer effects in laser-ablation plasma plumes , 2000, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics.

[45]  Mártin,et al.  Origin of the high-energy electron emission from metals under laser irradiation. , 1992, Physical review. B, Condensed matter.

[46]  L. Dubridge,et al.  A Further Experimental Test of Fowler's Theory of Photoelectric Emission , 1932 .

[47]  M. Sentis,et al.  Numerical study of ultra-short laser ablation of metals and of laser plume dynamics , 2004 .