Hybrid plasmonic cavity modes in arrays of gold nanotubes


Plasmonic structures are known to confine light at the nanometer scale, and they exhibit enhanced electromagnetic fields localized in small mode volumes. Here, plasmonic resonators based on a metamaterial consisting of periodic arrays of gold nanotubes embedded into anodic aluminum oxide are studied and strong confinement of local fields with low losses is demonstrated. Higher-order resonance modes of surface plasmons localized in gold nanotubes when the nanotube length exceeds some critical values are observed. The numerical simulations suggest that, the electric fields associated with some higher-order longitudinal modes for the long nanotubes and some lower-order longitudinal modes for the short nanotubes or the nanotubes with thin walls, are mainly localized at the interfaces between aluminum oxide and gold in the form of the standing-wave longitudinal plasmonic modes, partially localized in the pores and at two ends of the nanotubes owing to the strong coupling of the Fabry-Pérot resonances with extraordinary optical transmission effect in the periodical structures through the inner nanochannels of the nanotubes, so that the nanotubes play a role of efficient cavity resonators. The existence of hybrid plasmonic resonant cavity modes with asymmetrical distributions of the electric field resulting from the near-field coupling of both transversal and longitudinal modes in the gold nanotube metamaterials is revealed.

Publication DOI: https://doi.org/10.1002/adom.201600731
Divisions: Engineering & Applied Sciences
Engineering & Applied Sciences > Electrical, Electronic & Power Engineering
Engineering & Applied Sciences > Aston Institute of Photonics Technology
Additional Information: This is the peer reviewed version of the following article: Wang, J., Zhang, C., Zhang, J., Song, H., Wang, P., Lu, Y., ... Zhang, L. (2017). Hybrid plasmonic cavity modes in arrays of gold nanotubes. Advanced Optical Materials, 5 (4), which has been published in final form at http://dx.doi.org/10.1002/adom.201600731. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Uncontrolled Keywords: cavity modes,gold nanotube arrays metamaterials,hybrid resonance modes,plasmonic resonators,Electronic, Optical and Magnetic Materials,Atomic and Molecular Physics, and Optics
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2017-02-16
Published Online Date: 2016-11-25
Accepted Date: 2016-10-11
Submitted Date: 2016-09-07
Authors: Wang, Junfeng
Zhang, Cheng
Zhang, Junxi
Song, Haojie
Wang, Pei
Lu, Yonghua
Fei, Guangtao
Xu, Wen
Xu, Wei
Zhang, Lide
Kivshar, Yuri S.
Zhang, Lin ( 0000-0002-1691-5577)



Version: Accepted Version

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