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Fabrication of Ceramic Photonic Crystals with Diamond Structure for Microwave Applications

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A process for fabricating three-dimensional photonic crystals composed of SiO2–TiO2-based ceramics with a diamond structure was investigated. An epoxy structure having an inverse diamond configuration was fabricated by stereolithography, a rapid prototyping method. The epoxy structure was infiltrated with a ceramic slurry and then cold isostatically pressed. After sintering at 670°C for 5 h in air, the epoxy was burned off, leaving behind the desired structure of a ceramic photonic crystal. The calculated band diagram indicated that an absolute photonic band gap for all wave vectors existed. The measurement of transmission in the 〈100〉 direction from 10 to 20 GHz showed that a complete band gap formed at about 14.7–18.5 GHz. The magnitude of the maximum attenuation was as large as 30 dB at 17 GHz, which indicated that the fabricated structure worked well as a photonic crystal.
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Keywords: crystals/crystallization; fabrication; microwaves

Document Type: Research Article

Affiliations: Joining and Welding Research Institute, Osaka University, Osaka 567-0047, Japan

Publication date: April 1, 2004

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