We investigate light absorption in metal films, silver and aluminum, with different surface roughness. Measurements using an integrating sphere show that the reflectance in silver decreases significantly with increasing surface roughness whereas the reflectance in aluminum is almost constant. The experimental results agree well with numerical simulations in which the surface roughness of metal is described properly. In particular, the simulations demonstrate that the absorption by surface-plasmon-polaritons excited on a rough silver surface causes the surface-dependent reflectance in silver. This study suggests a convenient and feasible rule to rationally design a backside metal reflector toward high-efficiency light-emitting diodes and photovoltaics.
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3 January 2011
Research Article|
January 05 2011
Surface-plasmon-induced light absorption on a rough silver surface Available to Purchase
Sun-Kyung Kim;
Sun-Kyung Kim
1Department of Physics,
Korea University
, Seoul 136-701, Republic of Korea
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Ho-Seok Ee;
Ho-Seok Ee
1Department of Physics,
Korea University
, Seoul 136-701, Republic of Korea
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Woonkyung Choi;
Woonkyung Choi
2Advanced Technology Lab, LED Division,
LG Innotek
, Seoul 137-724, Republic of Korea
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Soon-Hong Kwon;
Soon-Hong Kwon
1Department of Physics,
Korea University
, Seoul 136-701, Republic of Korea
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Ju-Hyung Kang;
Ju-Hyung Kang
1Department of Physics,
Korea University
, Seoul 136-701, Republic of Korea
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Yoon-Ho Kim;
Yoon-Ho Kim
1Department of Physics,
Korea University
, Seoul 136-701, Republic of Korea
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Hoki Kwon;
Hoki Kwon
2Advanced Technology Lab, LED Division,
LG Innotek
, Seoul 137-724, Republic of Korea
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Hong-Gyu Park
Hong-Gyu Park
a)
1Department of Physics,
Korea University
, Seoul 136-701, Republic of Korea
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Sun-Kyung Kim
1
Ho-Seok Ee
1
Woonkyung Choi
2
Soon-Hong Kwon
1
Ju-Hyung Kang
1
Yoon-Ho Kim
1
Hoki Kwon
2
Hong-Gyu Park
1,a)
1Department of Physics,
Korea University
, Seoul 136-701, Republic of Korea
2Advanced Technology Lab, LED Division,
LG Innotek
, Seoul 137-724, Republic of Korea
a)
Author to whom correspondence should be addressed. Electronic mail: [email protected].
Appl. Phys. Lett. 98, 011109 (2011)
Article history
Received:
November 05 2010
Accepted:
December 20 2010
Citation
Sun-Kyung Kim, Ho-Seok Ee, Woonkyung Choi, Soon-Hong Kwon, Ju-Hyung Kang, Yoon-Ho Kim, Hoki Kwon, Hong-Gyu Park; Surface-plasmon-induced light absorption on a rough silver surface. Appl. Phys. Lett. 3 January 2011; 98 (1): 011109. https://doi.org/10.1063/1.3537812
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