Miniature resonator sensor based on a hybrid plasmonic nanoring

Xiaoming Ma, Shuzhen Fan, Heming Wei, Zhiyuan Zuo, Sridhar Krishnaswamy, Jiaxiong Fang

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


A miniature resonator sensor based on a hybrid plasmonic nanoring with a gold layer coated uniformly on the outer boundary is described and investigated. By using the Lumerical finite-difference-time-domain (FDTD) method, the optimized sizes of the plasmonic layer thickness and the central hole are given and insight into the dependence of spectral displacements, Q factors, sensitivity and detection limits on the ambient refractive index is presented. Simulation results reveal that the miniature resonator sensor featuring high sensitivity of 339.8 nm/RIU can be realized. The highest Q factor can reach ∼60,000 with this nanoring and the minimum detection limit is as low as 1.5 × 10−4 RIU. The effects on the resonance shifts and Q factors due to geometric shapes of the inner boundary of the nanoring are discussed as well. This miniature resonator sensor has good potential for highly sensitive ultracompact sensing applications.

Original languageEnglish (US)
Pages (from-to)33051-33060
Number of pages10
JournalOptics Express
Issue number23
StatePublished - 2019

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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