Highly ef ficient narrow-band plasmonic waveguide filter based on cascaded slot cavities

Authors:
  • ZCZongqiang Chen
    Zongqiang Chen
  • JCJing Chen
    Jing Chen
  • YLYudong Li
    Yudong Li
  • JQJun Qian
    Jun Qian
  • JQJiwei Qi
    Jiwei Qi
  • JXJingjun Xu
    Jingjun Xu
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Abstract
A novel plasmonic waveguide filter design based on three cascaded slot cavities is proposed. The cascaded nanocavities support a united resonant (UR) mode. Light is trapped in the middle nanocavity at telecommunication wavelength (1550 nm) when the UR mode exists. This phenomenon leads to the efficient transmittance and high Q factor of the plasmonic filter. The resonant wavelength and Q factor can be easily modulated by the cavity radii and the waveguide width.
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