Using stereolithography as an additive manufacturing (AM) process, photonic crystals, with a diamond‐like structure composed of alumina microlattices, were fabricated and their electromagnetic band gap profiles, in terahertz frequency ranges, were investigated. Acrylic resins with dispersed alumina particles were fabricated by stereolithography with micrometer‐order accuracy. After dewaxing and sintering processes, alumina lattices were obtained with high relative densities that reflected the terahertz waves, through Bragg diffraction, perfectly in all directions. Twinned crystal structures with mirror symmetric diamond lattices were designed to introduce defect interfaces. Double‐cavity defects consisting of unit cells hollowed from the diamond lattices formed the coupled resonation modes.

The fabrication and terahertz wave properties of alumina microphotonic crystals with a diamond structure were investigated. Acrylic diamond structures with alumina particles' dispersion were formed using microstereolithography. Fabricated precursors were dewaxed and sintered in air. The electromagnetic wave properties were measured by terahertz time‐domain spectroscopy. A complete photonic band gap was observed from 0.40 to 0.47 THz, and showed good agreement with the simulation of a plane wave expansion method. Moreover, a localized mode was observed by introducing a plane defect between twinned diamond structures. The localized mode was analyzed using transmission line modeling simulation.

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