Fabrication and Optical Properties of One Period of a Three-Dimensional Photonic Crystal Operating in the 5–10 µm Wavelength Region

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Abstract
A three-dimensional photonic crystal with one period of an asymmetric face-centered cubic structure is fabricated by utilizing a wafer fusion and a laser-beam-assisted alignment technique. By measuring the transmission spectrum of the photonic crystal for normal incidence ( direction), it is shown that ∼16 dB attenuation is successfully achieved which agrees well with the theoretical calculation. For various incidence angles from (Γ-X') to around (Γ-K) direction, it is found that the wavelength at which the transmission becomes minimal is shifted to the longer wave-length side together with the increase of the transmission. The shift of transmission can be qualitatively explained by the change in the band structure for the propagation direction.