@article{hwang2011plasmonic,
  title={Plasmonic stop band formation in a metal--insulator--metal ring with a narrow gap},
  author={Hwang, Yongsop and Kim, Jae-Eun and Park, Hae Yong and Kee, Chul-Sik},
  journal={Journal of Optics},
  volume={13},
  number={7},
  pages={075006},
  year={2011},
  publisher={IOP Publishing}
}