Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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Improved Plasmonic Filter, Ultra-Compact Demultiplexer, and Splitter

  • Rahimzadegan, Aso (Center of Excellence in Electromagnetics, Faculty of Electrical Engineering, K. N. Toosi University of Technology) ;
  • Granpayeh, Nosrat (Center of Excellence in Electromagnetics, Faculty of Electrical Engineering, K. N. Toosi University of Technology) ;
  • Hosseini, Seyyed Poorya (Center of Excellence in Electromagnetics, Faculty of Electrical Engineering, K. N. Toosi University of Technology)
  • Received : 2013.12.02
  • Accepted : 2014.04.21
  • Published : 2014.06.25
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Abstract

In this paper, metal insulator metal (MIM) plasmonic slot cavity narrow band-pass filters (NBPFs) are studied. The metal and dielectric of the structures are silver (Ag) and air, respectively. To improve the quality factor and attenuation range, two novel NBPFs based on tapered structures and double cavity systems are proposed and numerically analyzed by using the two-dimensional (2-D) finite difference time domain (FDTD) method. The impact of different parameters on the transmission spectrum is scrutinized. We have shown that increasing the cavities' lengths increases the resonance wavelength in a linear relationship, and also increases the quality factor, and simultaneously the attenuation of the wave transmitted through the cavities. Furthermore, increasing the slope of tapers of the input and output waveguides decreases attenuation of the wave transmitted through the waveguide, but simultaneously decreases the quality factor, hence there should be a trade-off between loss and quality factor. However, the idea of adding tapers to the waveguides' discontinuities of the simple structure helps us to improve the device total performance, such as quality factor for the single cavity and attenuation range for the double cavity. According to the proposed NBPFs, two, three, and four-port power splitters functioning at 1320 nm and novel ultra-compact two-wavelength and triple-wavelength demultiplexers in the range of 1300-1550 nm are proposed and the impacts of different parameters on their performances are numerically investigated. The idea of using tapered waveguides at the structure discontinuities facilitates the design of ultra-compact demultiplexers and splitters.

Keywords

References

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