Suppression of radiation loss by hybridization effect in two coupled split-ring resonators

T. Q. Li, H. Liu, T. Li, S. M. Wang, J. X. Cao, Z. H. Zhu, Z. G. Dong, S. N. Zhu, and X. Zhang

Phys. Rev. B 80, 115113 – Published 15 September 2009

Abstract

This paper investigates the radiation properties of two coupled split-ring resonators (SRRs). Due to electromagnetic coupling, two hybrid magnetic plasmon modes were induced in the structure. Our calculations show that the radiation loss of the structure was greatly suppressed by the hybridization effect. This led to a remarkable increase in the $Q$ factor of the coupled system compared to the single SRR. By adjusting the distance between the two SRRs, the $Q$ factor changed correspondingly due to different electromagnetic coupling strengths. This resulted in a coupled structure that functioned as a type of nanocavity with an adjustable $Q$ factor.

Received 30 March 2009

DOI:https://doi.org/10.1103/PhysRevB.80.115113

Authors & Affiliations

T. Q. Li¹, H. Liu^1,*, T. Li¹, S. M. Wang¹, J. X. Cao¹, Z. H. Zhu¹, Z. G. Dong¹, S. N. Zhu¹, and X. Zhang²

¹Department of Physics, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, People’s Republic of China
²Nanoscale Science and Engineering Center, University of California, 5130 Etcheverry Hall, Berkeley, California 94720-1740, USA

^*liuhui@nju.edu.cn; http://dsl.nju.edu.cn/dslweb/images/plasmonics-MPP.htm

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Vol. 80, Iss. 11 — 15 September 2009

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