title: Tunable high quality factor in two multimode plasmonic stubs waveguide.
abstract: We numerically investigate the optical characteristics of a metal-dielectric-metal (MDM) waveguide side-coupled with two identical multimode stub resonators. Double plasmon-induced transparency (PIT) peaks with narrow full width at half maximum (FWHM) and high quality factor (Q-factor) can be observed in this structure. The Q-factors of PIT peaks in two stub resonators system are larger than those in single stub resonator system. A multimode coupled-radiation oscillator theory (MC-ROT), which is derived from ROT, is proposed to analyze the spectral response in the multimode system for the first time. The analytical results are confirmed by the finite-difference time-domain (FDTD) simulation results. We can also find that the Q-factors of the two PIT peaks have an opposite evolution tendency with the change of the stubs parameters and the maximum can reach to 427. These results may provide some applications for ultrasensitive sensors, switches and efficient filters.
authors.affiliation: College of Physics and Electronic, Central South University, Changsha 410083, China.|College of Communication and Electronic Engineering, Hunan City University, Yiyang 413000, China.
authors.forename: Zhiquan
authors.initials: Z
authors.lastname: Chen
authors.affiliation: College of Physics and Electronic, Central South University, Changsha 410083, China.
authors.forename: Hongjian
authors.initials: H
authors.lastname: Li
authors.affiliation: College of Physics and Electronic, Central South University, Changsha 410083, China.
authors.forename: Shiping
authors.initials: S
authors.lastname: Zhan
authors.affiliation: College of Physics and Electronic, Central South University, Changsha 410083, China.
authors.forename: Boxun
authors.initials: B
authors.lastname: Li
authors.affiliation: College of Physics and Electronic, Central South University, Changsha 410083, China.
authors.forename: Zhihui
authors.initials: Z
authors.lastname: He
authors.affiliation: College of Physics and Electronic, Central South University, Changsha 410083, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Xu
authors.affiliation: College of Physics and Electronic, Central South University, Changsha 410083, China.
authors.forename: Mingfei
authors.initials: M
authors.lastname: Zheng