Photonic Band Engineering of Coupled Waveguide Using Geometrical Modulation
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概要
- 論文の詳細を見る
A two-dimensional photonic crystal directional coupler is a flexible optical component that can easily change optical properties such as operating frequency, wavenumber, and group velocity. We investigate the changes in the photonic bands with geometrical modulations such as radii and positions of air holes by the finite-difference time-domain method. Following the calculations, we classified the modulations by their effects on the photonic band: producing a flat band and shifting the normalized frequency of propagation modes of the coupled waveguide. We also discuss the physical implications of the relationship between the modulations and their effects on photonic bands. Finally, we applied this knowledge to the adjustment of the normalized frequency of a flat band, and then, we show that the normalized frequency of a flat band 0.291 can be decreased to 0.286. This demonstration indicates that the findings of this study can be used to obtain the desired optical properties of a directional coupler.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2008-12-25
著者
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Komori Kazuhiro
Research Institute Of Photonics National Institute Of Advanced Industrial Science And Technology (ai
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Yatagai Toyohiko
University Of Tsukuba Institute Of Applied Physics
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Yamamoto Noritsugu
Research Institute Of Photonics National Institute Of Advanced Industrial Science And Technology (ai
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Itoh Masahide
University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
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Jeong Seok-Hwan
Research Institute of Photonics, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
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Yamamoto Noritsugu
Research Institute of Photonics, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
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Sugisaka Jun-ichiro
Research Institute of Photonics, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
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Yatagai Toyohiko
University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
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