Numerical examination on frequency division characteristics of photonic crystal waveguide by FDTD method

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  • FDTD法を用いたフォトニック結晶導波路における周波数分離特性に関する数値的検討
  • FDTDホウ オ モチイタ フォトニック ケッショウ ドウハロ ニ オケル シュウハスウ ブンリ トクセイ ニ カンスル スウチテキ ケントウ

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Abstract

In the past few years, there have been tremendous activities in the fabrication and testing of crystals from both the theoretical and experimental points of view. It is important for designing optical functional devices to clarify fundamental properties of basic crystal waveguides, such as the straight waveguide, direction coupler, microcavity and so on. Two-dimensional photonic crystal (PC) waveguide with the microcavity is examined numerically by FDTD method. We use an absorbing boundary condition (ABC) at the edge of the window called Mur's ABC. The structure of the PC is the triangular array and the microcavity is made by removing the several crystals in parallel with the PC waveguide. The effects of the number of removed pillars and the radius of the surrounding pillars on the resonance are examined. From the numerical results, we show that resonance frequency can be determined by adjusting the number of removed pillars and the radius of the surrounding pillars. Also, the structure which takes out the light is examined from the practical point of view.

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