Related Experiment Video
Updated: Feb 16, 2026

Engineering Antiviral Agents via Surface Plasmon Resonance
Published on: June 14, 2022
Plasmonic Refractive Index Sensor with High Figure of Merit Based on Concentric-Rings Resonator
Zhaojian Zhang1, Junbo Yang2, Xin He3
1College of Liberal Arts and Sciences, National University of Defense Technology, Changsha 410073, China. 376824388@sjtu.edu.cn.
Abstract:
A plasmonic refractive index (RI) sensor based on metal-insulator-metal (MIM) waveguide coupled with concentric double rings resonator (CDRR) is proposed and investigated numerically. Utilizing the novel supermodes of the CDRR, the FWHM of the resonant wavelength can be modulated, and a sensitivity of 1060 nm/RIU with high figure of merit (FOM) 203.8 is realized in the near-infrared region. The unordinary modes, as well as the influence of structure parameters on the sensing performance, are also discussed. Such plasmonic sensor with simple framework and high optical resolution could be applied to on-chip sensing systems and integrated optical circuits. Besides, the special cases of bio-sensing and triple rings are also discussed.
Related Concept Videos
Rules for Significant Figures
It should be emphasized that when we represent measured values, the...
Uncertainty in Measurement: Significant Figures
Significant Figures in Calculations
Resonance
Concentration Cells
Consider the following voltaic cell:
Concentration and Rate Law
For example, in a generic reaction aA + bB ⟶ products, where a and b are stoichiometric coefficients, the rate law can be written as:

