We investigate optical responses of arrays of flat, quasitriangular nanoparticles made by the self-assembly sphere lithography of a 20 nm thick gold film. The measured optical absorption spectra show strong, particle size dependent resonances, in excellent agreement with our simulations. We identify those resonances as due to standing surface/edge plasmon-polariton waves.

1.
A.
Sánchez-Iglesias
,
I.
Pastoriza-Santos
,
J.
Pérez-Juste
,
B.
Rodríguez-González
,
F. J.
García de Abajo
, and
L. M.
Liz-Marzán
,
Adv. Mater.
18
,
2529
(
2006
);
C. J.
Johnson
,
E.
Dujardin
,
S. A.
Davis
,
C. J.
Murphy
, and
S.
Mann
,
J. Mater. Chem.
12
,
1765
(
2002
);
H.
Chen
,
J.
Wang
,
H.
Yu
,
H.
Yang
,
S.
Xie
, and
J.
Li
,
J. Phys. Chem. B
109
,
2573
(
2005
);
[PubMed]
Z. L.
Wang
,
M. B.
Mohamed
,
S.
Link
, and
M. A.
El-Sayed
,
Surf. Sci.
440
,
L809
(
1999
);
A. I.
Kirkland
,
P. P.
Edwards
,
D. A.
Jefferson
, and
D. G.
Duff
,
Annu. Rep. Prog. Chem., Sect. C: Phys. Chem.
87
,
247
(
1990
);
R.
Jin
,
C. Y.
Cao
,
E.
Hao
,
G.
Métraux
,
G. C.
Schatz
, and
C. A.
Mirkin
,
Nature (London)
425
,
487
(
2003
);
C.
Lofton
and
W.
Sigmund
,
Adv. Funct. Mater.
15
,
1197
(
2005
).
2.
J.
Nelayah
,
L.
Gu
,
W.
Sigle
,
C. T.
Koch
,
I.
Pastoriza-Santos
,
L. M.
Liz-Marzán
, and
P. A.
van Aken
,
Opt. Lett.
34
,
1003
(
2009
).
3.
W.
Kandulski
, “
Shadow Nanosphere Lithography
,” Ph.D. thesis,
Bonn University
,
2007
;
A.
Kosiorek
,
W.
Kandulski
,
H.
Glaczynska
, and
M.
Giersig
,
Small
1
,
439
(
2005
);
[PubMed]
A.
Kosiorek
,
W.
Kandulski
,
P.
Chudzinski
,
K.
Kempa
, and
M.
Giersig
,
Nano Lett.
4
,
1359
(
2004
).
4.
K.
Kolwas
,
Appl. Phys. B: Lasers Opt.
66
,
467
(
1998
).
5.
C.
Bréchignac
and
J. P.
Connerade
,
J. Phys. B
27
,
3795
(
1994
).
6.
X.
Wang
and
K.
Kempa
,
Phys. Rev. B
71
,
233101
(
2005
).
7.
A.
Taflove
,
Computational Electrodynamics: The Finite-Difference Time-Domain Method
(
Artech House
,
Norwood, MA
,
1995
).
8.
The Lorentzian expansion of the Au dielectric function used in the simulations was fitted to the experimental data given in
P. B.
Johnson
and
R. W.
Christy
,
Phys. Rev. B
6
,
4370
(
1972
). However to aid the code convergence, the imaginary part was increased, which leads to broader resonance peaks (inset in Fig. 3), as compared to those from the experiment (inset in Fig. 2). This purely numerical adjustment did not affect significantly the peak maxima locations, the main feature studied in this work.
9.
C.
Vandenbem
and
J. P.
Vigneron
,
J. Opt. Soc. Am. A
22
,
1042
(
2005
);
M.
Scharte
,
R.
Porath
,
T.
Ohms
,
M.
Aeschlimann
,
J. R.
Krenn
,
H.
Ditlbacher
,
F. R.
Aussenegg
, and
A.
Liebsch
,
Appl. Phys. B: Lasers Opt.
73
,
305
(
2001
).
10.
L.
Brey
,
N. F.
Johnson
, and
B. I.
Halperin
,
Phys. Rev. B
40
,
10647
(
1989
);
P.
Bakshi
,
D. A.
Broido
, and
K.
Kempa
,
Phys. Rev. B
42
,
7416
(
1990
).
11.
13.
This assures the nonretarded limit at the frequencies of interest.
14.
L. B.
Scaffardi
and
J. O.
Tocho
,
Nanotechnology
17
,
1309
(
2006
).
You do not currently have access to this content.