Giant-enhancement of extraordinary optical
transmission through nanohole arrays blocked
by plasmonic goldmushroom caps
Qing Zhang
1, 2
and Chengpu Liu
2,*
1
College of Sciences, Shanghai University, Shanghai 200444, China
2
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics,
Shanghai 201800, China
*
chpliu@siom.ac.cn
Abstract: An improved plasmonic hole array nanostructure model with the
holes blocked by gold mushroom caps is proposed and it can realize a
maximum transmission with efficiency up to 65%, 182% larger than the
unblocked hole nano array, although the area ratio of the holes to the Au
film is only 12%, due to the strong coupling between caps and holes,
working as cavity antenna. The numerical simulations confirm that this
improved model provides a more consistent comparison with the
experimental results with a nanodisk model instead [Opt. Express 19, 21098
(2011)]. Moreover, the light transmission property sensitively depends on
the geometric parameters of this new nanostructure. When the gap between
caps and holes or the cap’s diameter changed, there always exists one
optimal transmission peak in efficiency. The corresponding optimal
wavelength decreases with the increment of the gap or the decrement of the
cap’s diameter, basically in an exponential decaying way. The decay rate is
obviously influenced by the cap’s parameters.
©2014 Optical Society of America
OCIS codes: (310.6628) Subwavelength structures, nanostructures; (240.6680) Surface
plasmons; (240.0240) Optics at surfaces.
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