Plasmonics

, Volume 7, Issue 3, pp 441–445

Plasmonic Y-splitters of High Wavelength Resolution Based on Strongly Coupled-Resonator Effects

  • Jianjun Chen
  • Zhi Li
  • Ming Lei
  • Xiuli Fu
  • Jinghua Xiao
  • Qihuang Gong
Article

DOI: 10.1007/s11468-011-9326-0

Cite this article as:
Chen, J., Li, Z., Lei, M. et al. Plasmonics (2012) 7: 441. doi:10.1007/s11468-011-9326-0

Abstract

Based on the strongly coupled-resonator effects, a high wavelength-resolution plasmonic Y-splitter, consisting of a Y-branch metal–insulator–metal waveguide with a baffle in each channel, is numerically investigated using the finite element method. Due to the coupling of different resonators (with nearly equal bandwidths) in the Y-splitter, sharp and asymmetric transmission spectra occur. This greatly increases the wavelength resolution of the Y-splitter to be Δλ ≈ 15 nm, which is significantly narrower than the bandwidth of the single resonator (ΔλFWHM ≈ 110 nm). An analytic model based on the scattering matrix theory is provided to describe and explain this phenomenon.

Keywords

Surface plasmon polaritonsCoupled-resonator systemAsymmetric spectraScattering matrix theory

Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Jianjun Chen
    • 1
    • 2
    • 3
  • Zhi Li
    • 3
  • Ming Lei
    • 1
    • 2
  • Xiuli Fu
    • 1
    • 2
  • Jinghua Xiao
    • 1
    • 2
  • Qihuang Gong
    • 3
  1. 1.State Key Laboratory of Information Photonics and Optical CommunicationsBeijing University of Posts and TelecommunicationsBeijingChina
  2. 2.School of ScienceBeijing University of Posts and TelecommunicationsBeijingChina
  3. 3.State Key Laboratory for Mesoscopic Physics and Department of PhysicsPeking UniversityBeijingChina