Near-field coupling and resonant cavity modes in plasmonic nanorod metamaterials


Plasmonic resonant cavities are capable of confining light at the nanoscale, resulting in both enhanced local electromagnetic fields and lower mode volumes. However, conventional plasmonic resonant cavities possess large Ohmic losses at metal-dielectric interfaces. Plasmonic near-field coupling plays a key role in a design of photonic components based on the resonant cavities because of the possibility to reduce losses. Here, we study the plasmonic near-field coupling in the silver nanorod metamaterials treated as resonant nanostructured optical cavities. Reflectance measurements reveal the existence of multiple resonance modes of the nanorod metamaterials, which is consistent with our theoretical analysis. Furthermore, our numerical simulations show that the electric field at the longitudinal resonances forms standing waves in the nanocavities due to the near-field coupling between the adjacent nanorods, and a new hybrid mode emerges due to a coupling between nanorods and a gold-film substrate. We demonstrate that this coupling can be controlled by changing the gap between the silver nanorod array and gold substrate.

Publication DOI:
Divisions: Engineering & Applied Sciences
Engineering & Applied Sciences > Electrical, Electronic & Power Engineering
Engineering & Applied Sciences > Aston Institute of Photonics Technology
Additional Information: © IOP
Uncontrolled Keywords: cavity,metamaterials,nanorod arrays,near-field coupling,plasmonic resonance,resonance modes,silver nanorods,Bioengineering,Chemistry(all),Materials Science(all),Mechanics of Materials,Mechanical Engineering,Electrical and Electronic Engineering
Full Text Link: http://iopscien ... /41/415708/meta
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2016-09-08
Accepted Date: 2016-07-19
Submitted Date: 2016-05-17
Authors: Song, Haojie
Zhang, Junxi
Fei, Guangtao
Wang, Junfeng
Jiang, Kang
Wang, Pei
Lu, Yonghua
Iorsh, Ivan
Xu, Wei
Jia, Junhui
Zhang, Lide
Kivshar, Yuri S.
Zhang, Lin ( 0000-0002-1691-5577)



Version: Accepted Version

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