Abstract
We propose a plasmonic nanosensor based on Fano resonance in the strong-confinement metal–dielectric–metal waveguide side-coupled with a pair of nanoresonators. Due to the coherent interference of the splitting discrete and quasi-continuum modes, the reflection spectrum possesses a sharp asymmetric Fano resonance dip, which is dependent on the cavity–cavity phase and the refractive index change of the dielectric. The physical features contribute to a highly efficient plasmonic sensor for refractive index sensing. The nanosensor yields a sensitivity of and a figure of merit of , remarkable values compared with those of plasmonic sensors supported by perfect absorbers.
© 2012 Optical Society of America
Full Article | PDF ArticleMore Like This
Xiaobin Ren, Kun Ren, and Yuanxue Cai
Appl. Opt. 56(31) H1-H9 (2017)
F. Chen and W. X. Yang
J. Opt. Soc. Am. B 40(4) 736-742 (2023)
Jianjun Chen, Chengwei Sun, and Qihuang Gong
Opt. Lett. 39(1) 52-55 (2014)