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2015 ; 5
(ä): 10823
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Dynamic mode coupling in terahertz metamaterials
#MMPMID26035057
Su X
; Ouyang C
; Xu N
; Tan S
; Gu J
; Tian Z
; Singh R
; Zhang S
; Yan F
; Han J
; Zhang W
Sci Rep
2015[Jun]; 5
(ä): 10823
PMID26035057
show ga
The near and far field coupling behavior in plasmonic and metamaterial systems
have been extensively studied over last few years. However, most of the coupling
mechanisms reported in the past have been passive in nature which actually fail
to control the coupling mechanism dynamically in the plasmonic metamaterial
lattice array. Here, we demonstrate a dynamic mode coupling between resonators in
a hybrid metal-semiconductor metamaterial comprised of metallic concentric rings
that are physically connected with silicon bridges. The dielectric function of
silicon can be instantaneously modified by photodoped carriers thus tailoring the
coupling characteristics between the metallic resonators. Based on the
experimental results, a theoretical model is developed, which shows that the
optical responses depend on mode coupling that originates from the variation of
the damping rate and coupling coefficient of the resonance modes. This particular
scheme enables an in-depth understanding of the fundamental coupling mechanism
and, therefore, the dynamic coupling enables functionalities and applications for
designing on-demand reconfigurable metamaterial and plasmonic devices.