Abstract
Fabrication and terahertz wave properties of alumina microphotonic crystals with a diamond structure were investigated. The three-dimensional diamond structure was designed on a computer using 3D-CAD software. The designed lattice constant was 500 μm. The structure consisted of 8 × 8 × 4 unit cells. Acrylic diamond structures with an alumina dispersion of 40 vol% were formed by using microstereolithography. Fabricated precursors were dewaxed at 600 °C and sintered at 1500 °C. The linear shrinkage ratio was about 25%. The relative density reached 97.5%. The electromagnetic wave properties were measured by terahertz time-domain spectroscopy. A complete photonic band gap was observed at the frequency range from 0.40 THz to 0.47 THz, and showed good agreement with the simulation results calculated by the plane wave expansion method. Moreover, localized modes were obtained at the frequencies 0.42 THz and 0.46 THz by introducing an air defect in the diamond structure. They corresponded to the simulation by the transmission line modeling method.
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This work was supported by the Grant-in-Aid for Scientific Research (S) No. 171067010, both under the auspices of the Ministry of Education, Culture, Sports, Science and Technology, Japan.
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Kanaoka, H., Kirihara, S. & Miyamoto, Y. Terahertz wave properties of alumina microphotonic crystals with a diamond structure. Journal of Materials Research 23, 1036–1041 (2008). https://doi.org/10.1557/jmr.2008.0122
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DOI: https://doi.org/10.1557/jmr.2008.0122