Ultra-Small GaAs-Photonic-Crystal-Slab-Waveguide-Based Near-Infrared Components: Fabrication, Guided-Mode Identification, and Estimation of Low-Loss and Broad-Band-Width in Straight-Waveguides, 60°-Bends and Y-Splitters
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概要
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We designed and fabricated ultra-small photonic-crystal (PC)-waveguide (WG)-based components of straight-WGs, 60°-bends and Y-splitters, utilizing single-line-defect in the air-bridge type GaAs PC, and revealed their optical properties in detail by observing a transmittance ($T$) spectrum over a broad wavelength-region from 850 to 1600 nm. For this purpose, we developed a halogen-lamp-based spectrometer for an ultra-thin slab-sample, which has turned out very useful. We also calculated the corresponding $T$-spectrum by using three-dimensional finite-difference-time-domain method. In all cases where comparison is possible, the observed spectrum agrees essentially with the calculated one. Owing to these broad spectra, we have unambiguously identified the high-$T$ region due to single guided-mode in the respective components. Comparisons of the spectrum between different samples or components, such as the straight-WGs with much different lengths, or the straight-WG and the sharp bend have also helped to reasonably interpret the observed spectra, allowing a comprehensive understanding of optical properties of those components. The propagation loss and the band width in each component could also be estimated from the comparison. The loss is estimated as $1.5 \pm 0.5$ dB/mm for the straight-WG, while less than 1 dB/bend, if it exists, for the bend WG, and both band-widths are broader than 40 nm. We also find that the Y-splitter is capable of dividing light into two ports almost equally in intensity with a total transmittance of more than 85%; the band-width is broader than 40 nm. As a result, we have found that all those should be useful as key components in future ultra-fast planar optical integrated circuits.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2004-09-15
著者
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Inoue Kuon
Chitose Institute Of Science And Technology
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ASAKAWA Kiyoshi
The Femtosecond Technology Research Association (FESTA)
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TANAKA Yu
The Femtosecond Technology Research Association
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SUGIMOTO Yoshimasa
The Femtosecond Technology Research Association
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IKEDA Naoki
The Femtosecond Technology Research Association
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MARUYAMA Taishi
Chitose Institute of Science and Technology
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MIYASHITA Kazuya
Chitose Institute of Science and Technology
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ISHIDA Koji
Chitose Institute of Science and Technology
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Watanabe Yoshinori
National Institute Of Advanced Industrial Science And Technology (aist)
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Ikeda Naoki
The Femtosecond Technology Research Association, Tsukuba, Ibaraki 300-2635, Japan
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Asakawa Kiyoshi
The Femtosecond Technology Research Association, Tsukuba, Ibaraki 300-2635, Japan
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Maruyama Taishi
Chitose Institute of Science and Technology, Chitose, Hokkaido 066-8655, Japan
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Tanaka Yu
The Femtosecond Technology Research Association, Tsukuba, Ibaraki 300-2635, Japan
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