Role of interference between localized and propagating surface waves on the extraordinary optical transmission through a subwavelength-aperture array.
We report in this Letter that when radiation is incident on a metal surface perforated with an array of ring-shaped subwavelength apertures, the phase difference between the propagating surface Bloch wave and the localized surface wave can be tailored by the geometrical parameters of the array so as to affect the shape of the transmission spectrum. Above the resonant frequency of the aperture, interference between the two kinds of surface waves leads to a minimum in the transmission spectrum, whereas below it, the interference leads to a maximum. We suggest that this feature provides flexibility in engineering surface-wave-based all-optical devices.
Bao
Yong-Jun
YJ
National Laboratory of Solid State Microstructures & Department of Physics, Nanjing University, Nanjing 210093, China.
Peng
Ru-Wen
RW
Shu
Da-Jun
DJ
Wang
Mu
M
Lu
Xiang
X
Shao
Jun
J
Lu
Wei
W
Ming
Nai-Ben
NB