We explore the use of plasmonic Ag nanorod arrays featuring enhanced photoemission as high-brightness photocathode material. Silver nanorod arrays are synthesized by the direct current electrodeposition method and their dimensionality, uniformity, crystallinity, and oxide/impurity content are characterized. The yielded arrays exhibit greatly enhanced two-photon photoemission under 400 nm femtosecond pulsed laser excitation. Plasmonic field enhancement in the array produces photoemission hot spots that are mapped using photoemission electron microscopy. The relative photoemission enhancement of nanorod hot spots relative to that of a flat Ag thin film is found to range between 102 and 3 × 103.
REFERENCES
1.
D. H.
Dowell
, I.
Bazarov
, B.
Dunham
, K.
Harkay
, C.
Hernandez-Garcia
, R.
Legg
, H.
Padmore
, T.
Rao
, J.
Smedley
, and W.
Wan
, Nucl. Instrum. Methods Phys. Res. A
622
(3
), 685
–697
(2010
).2.
M. R.
Armstrong
, K.
Boyden
, N. D.
Browning
, G. H.
Campbell
, J. D.
Colvin
, W. J.
DeHope
, A. M.
Frank
, D. J.
Gibson
, F.
Hartemann
, J. S.
Kim
, W. E.
King
, T. B.
LaGrange
, B. J.
Pyke
, B. W.
Reed
, R. M.
Shuttlesworth
, B. C.
Stuart
, and B. R.
Torralva
, Ultramicroscopy
107
(4–5
), 356
–367
(2007
).3.
N. D.
Browning
, M. A.
Bonds
, G. H.
Campbell
, J. E.
Evans
, T.
LaGrange
, K. L.
Jungjohann
, D. J.
Masiel
, J.
McKeown
, S.
Mehraeen
, B. W.
Reed
, and M.
Santala
, Curr. Opin. Solid State Mater. Sci.
16
(1
), 23
–30
(2012
).4.
V.
Shutthanandan
, Z.
Zhu
, M. L.
Stutzman
, F. E.
Hannon
, C.
Hernandez-Garcia
, M. I.
Nandasiri
, S. V. N. T.
Kuchibhatla
, S.
Thevuthasan
, and W. P.
Hess
, Phys. Rev. ST Accel. Beams
15
(6
), 063501
(2012
).5.
W.
He
, S.
Vilayurganapathy
, A. G.
Joly
, T. C.
Droubay
, S. A.
Chambers
, J. R.
Maldonado
, and W. P.
Hess
, Appl. Phys. Lett.
102
(7
), 071604
(2013
).6.
Z.
Liu
, Y.
Sun
, P.
Pianetta
, J. R.
Maldonado
, R. F. W.
Pease
, and S.
Schuetter
, Appl. Phys. Lett.
90
(23
), 231115
(2007
).7.
J. R.
Maldonado
, Z.
Liu
, D. H.
Dowell
, R. E.
Kirby
, Y.
Sun
, P.
Pianetta
, and F.
Pease
, Phys. Rev. ST Accel. Beams
11
(6
), 060702
(2008
).8.
J. R.
Maldonado
, Z.
Liu
, D. H.
Dowell
, R. E.
Kirby
, Y.
Sun
, P.
Pianetta
, and F.
Pease
, Microelectron. Eng.
86
(4–6
), 529
–531
(2009
).9.
J. R.
Maldonado
, P.
Pianetta
, D. H.
Dowell
, J.
Smedley
, and P.
Kneisel
, J. Appl. Phys.
107
(1
), 013106
(2010
).10.
A.
Polyakov
, C.
Senft
, K. F.
Thompson
, J.
Feng
, S.
Cabrini
, P. J.
Schuck
, H. A.
Padmore
, S. J.
Peppernick
, and W. P.
Hess
, Phys. Rev. Lett.
110
(7
), 076802
(2013
).11.
R. K.
Li
, H.
To
, G.
Andonian
, J.
Feng
, A.
Polyakov
, C. M.
Scoby
, K.
Thompson
, W.
Wan
, H. A.
Padmore
, and P.
Musumeci
, Phys. Rev. Lett.
110
(7
), 074801
(2013
).12.
K.
Németh
, K. C.
Harkay
, M.
van Veenendaal
, L.
Spentzouris
, M.
White
, K.
Attenkofer
, and G.
Srajer
, Phys. Rev. Lett.
104
(4
), 046801
(2010
).13.
G. C.
Papavassiliou
, Prog. Solid State Chem.
12
(3–4
), 185
–271
(1979
).14.
J. C.
Hulteen
and C. R.
Martin
, J. Mater. Chem.
7
(7
), 1075
–1087
(1997
).15.
C. R.
Martin
, Chem. Mater.
8
(8
), 1739
–1746
(1996
).16.
Y.
Du
, L.
Shi
, T.
He
, X.
Sun
, and Y.
Mo
, Appl. Surf. Sci.
255
(5
), Part 1, 1901
–1905
(2008
).17.
G.
Riveros
, S.
Green
, A.
Cortes
, H.
Gomez
, R.
Marotti
, and E.
Dalchiele
, Nanotechnology
17
(2
), 561
–570
(2006
).18.
G.
Sauer
, G.
Brehm
, S.
Schneider
, K.
Nielsch
, R. B.
Wehrspohn
, J.
Choi
, H.
Hofmeister
, and U.
Gosele
, J. Appl. Phys.
91
(5
), 3243
–3247
(2002
).19.
G. D.
Sulka
, A.
Brzózka
, L.
Zaraska
, and M.
Jaskuła
, Electrochim. Acta
55
(14
), 4368
–4376
(2010
).20.
W.
Xu
, L.
Zhang
, J.
Zhang
, X.
Hu
, and L.
Sun
, Appl. Surf. Sci.
255
(13–14
), 6612
–6614
(2009
).21.
See supplementary material at http://dx.doi.org/10.1063/1.4825262 for GIXRD, power dependence, SERS, and enhancement data.
22.
M.
Straumanis
and C.
Woodward
, Acta Crystallogr.
27
, 549
–551
(1971
).23.
G.
Xiong
, R.
Shao
, S. J.
Peppernick
, A. G.
Joly
, K. M.
Beck
, W. P.
Hess
, M.
Cai
, J.
Duchene
, J. Y.
Wang
, and W. D.
Wei
, JOM
62
(12
), 90
–93
(2010
).24.
M.
Chelvayohan
and C. H. B.
Mee
, J. Phys. C
15
(10
), 2305
–2312
(1982
).25.
S. J.
Peppernick
, A. G.
Joly
, K. M.
Beck
, and W. P.
Hess
, J. Chem. Phys.
138
(15
), 154701
(2013
).26.
G. V.
Hartland
, Chem. Rev.
111
(6
), 3858
–3887
(2011
).27.
S.
Link
and M. A.
El-Sayed
, J. Phys. Chem. B
103
(40
), 8410
–8426
(1999
).© 2013 AIP Publishing LLC.
2013
AIP Publishing LLC
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