Electromagnetically induced transparency of a plasmonic metamaterial light absorber based on multilayered metallic nanoparticle sheets.
In this study, we observed the peak splitting of absorption spectra for two-dimensional sheets of silver nanoparticles due to the electromagnetically induced transparency (EIT) effect. This unique optical phenomenon was observed for the multilayered nanosheets up to 20 layers on a metal substrate, while this phenomenon was not observed on a transparent substrate. The wavelength and intensities of the split peaks depend on the number of layers, and the experimental results were well reproduced by the calculation of the Transfer-Matrix method by employing the effective medium approximation. The Ag nanosheets used in this study can act as a plasmonic metamaterial light absorber, which has a such large oscillator strength. This phenomenon is a fundamental optical property of a thin film on a metal substrate but has never been observed because native materials do not have a large oscillator strength. This new type of EIT effect using a plasmonic metamaterial light absorber presents the potential for the development of future optic and photonic technologies.
Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka, 819-0395, Japan.
Koichi
K
Okamoto
Department of Electrical and Electronic Engineering, National Institute of Technology, Oita College, Oita, 870-0152, Japan.
Daisuke
D
Tanaka
Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka, 819-0395, Japan.
Ryo
R
Degawa
Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka, 819-0395, Japan.
Xinheng
X
Li
Education Center for Global Leaders in Molecular Systems for Devices, Kyushu University, Fukuoka, 819-0395, Japan.
Pangpang
P
Wang
Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka, 819-0395, Japan.
Sou
S
Ryuzaki
Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka, 819-0395, Japan.
Kaoru
K
Tamada