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2018 ; 5
(3
): 1700487
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Toroidal Localized Spoof Plasmons on Compact Metadisks
#MMPMID29593952
Qin P
; Yang Y
; Musa MY
; Zheng B
; Wang Z
; Hao R
; Yin W
; Chen H
; Li E
Adv Sci (Weinh)
2018[Mar]; 5
(3
): 1700487
PMID29593952
show ga
Localized spoof surface plasmons (LSSPs) have recently emerged as a new research
frontier due to their unique properties and increasing applications. Despite the
importance, most of the current researches only focus on electric/magnetic LSSPs.
Very recent research has revealed that toroidal LSSPs, LSSPs modes with multipole
toroidal moments, can be achieved at a point defect in a 2D groove metal array.
However, this metamaterial shows the limitations of large volume and poor
compatibility to photonic integrated circuits. To overcome the above challenges,
here it is proposed and experimentally demonstrated compact planar metadisks
based on split ring resonators to support the toroidal LSSPs at microwave
frequencies. Additionally, it is experimentally demonstrated that the toroidal
LSSPs resonance is very sensitive to the structure changes and the background
medium. These might facilitate its utilization in the design and application of
plasmonic deformation sensors and the refractive index sensors.