Applied Physics B

, Volume 95, Issue 4, pp 745–749

Improved amplitude–frequency characteristics for T-splitter photonic crystal waveguides in terahertz regime

  • S. Li
  • H.-W. Zhang
  • Q.-Y. Wen
  • Y.-Q. Song
  • W.-W. Ling
  • Y.-X. Li
Article

Abstract

Based on the plane-wave expansion method, we calculate TE/TM gaps of 2-D photonic crystals (PCs) with typical square lattices composed of the silicon rods in air. Using the finite-difference time-domain method, we simulate the electromagnetic field distribution of THz waves in photonic crystals T-splitters. By the improved T-splitter with a rod in the junction, we achieved the amplitude–frequency characteristics of a pass band of 84% from 1.12 to 1.22 THz and surpassed by 76% the amplitude consistency of common T-splitters. And using the finite-difference time-domain method, we demonstrated that the improved T-splitter excels a common T-splitter in the degree of separation between the two output ports. These results provide a useful guide and a theoretical basis for the developments of THz functional components.

PACS

42.79.Gn 41.20.Jb 42.70.Qs 

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • S. Li
    • 1
  • H.-W. Zhang
    • 1
  • Q.-Y. Wen
    • 1
  • Y.-Q. Song
    • 1
  • W.-W. Ling
    • 1
  • Y.-X. Li
    • 1
  1. 1.State Key Laboratory of Electronic Thin Film and Integrated DevicesUniversity of Electronic Science and Technology of ChinaChengduPeople’s Republic of China

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