High-power femtosecond laser pulses have been used to excite surface plasmons in 500 Å silver and gold films. Nonlinear excitation results in the emission of electron bunches through multiphoton excitation at low power and laser-induced field emission at high power. The energies of photoelectrons are found to extend as high as 0.4 keV. Calculations show that these high energies are due to ponderomotive acceleration in an evanescent field extending from the metal film out into the vacuum. The theoretical calculations suggest that femtosecond electron pulses with relativistic energies can be generated using longer wavelengths or by developing the surface morphology.

Topics
Wave mechanics, Mass-energy equivalence, Multiphoton excitation, Femtosecond electron pulse, Femtosecond lasers, Plasmons, Plasma acceleration
1.
C.
Gahn
,
G. D.
Tsakiris
, and
A.
Pukhov
,
Phys. Rev. Lett.
83
,
4772
(
1999
).
Google Scholar
 
2.
T.
Tsang
,
T.
Srinivasanrao
, and
J.
Fischer
,
Phys. Rev. B
43
,
8870
(
1991
).
Google Scholar
 
3.
H.-T.
Chou
,
J. C.
Villagran
, and
J. C.
Thompson
,
Phys. Rev. B
44
,
3359
(
1991
).
Google Scholar
 
4.
X.
Liu
,
D.
Du
, and
G.
Mourou
,
IEEE J. Quantum Electron.
33
,
1706
(
1997
).
Google Scholar
 
5.
H.
Chen
,
J.
Boneberg
, and
P.
Leiderer
,
Phys. Rev. B
47
,
9956
(
1993
).
Google Scholar
 
6.
C.
Toth
,
G.
Farkas
, and
K. L.
Vodopyanov
,
Appl. Phys. B: Photophys. Laser Chem.
53
,
221
(
1991
).
Google Scholar
 
7.
M. V.
Exter
and
A.
Lagendijk
,
Phys. Rev. Lett.
60
,
49
(
1988
).
Google Scholar
 
8.
J. Y.
Bigot
,
J. C.
Merle
, and
O.
Cregut
,
Phys. Rev. Lett.
75
,
4702
(
1995
).
Google Scholar
 
9.
M.
Perner
,
P.
Bost
,
U.
Lemmer
,
G.
vonPlessen
,
J.
Feldman
,
U.
Becker
,
M.
Mennig
, and
H.
Schmidt
,
Phys. Rev. Lett.
78
,
2192
(
1997
).
Google Scholar
 
10.
M. J.
Feldstein
,
P.
Vohringer
,
W.
Wang
, and
N. F.
Scherer
,
J. Phys. Chem.
100
,
4739
(
1996
).
Google Scholar
 
11.
L. D. Landau and E. M. Lifshitz, Mechanics (Oxford University Press, Oxford, 1969).
12.
C. A.
Brau
,
Nucl. Instrum. Methods Phys. Res. A
407
,
1
(
1998
).
Google Scholar
 
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