Using numerical simulations, we systematically investigated the transmission properties of coupled-cavity waveguides (CCWs) formed in two-dimensional photonic-crystal dielectric slabs with a triangular array of air holes. We place emphasis on achieving a quasi-flat impurity band in such CCWs, which is important for the perfect transmission of ultrashort optical pulses. We show that the quasi-flat impurity band can be obtained by controlling the ratio of the air-hole radius to the lattice constant in the triangular lattice. As an example, we demonstrate the perfect transmission of a 500-fs-wide optical pulse through a CCW with a quasi-flat impurity band, indicating the possibility of application to high-speed all-optical communication systems with a maximum bit rate of approximately terabits per second.
© 2003 Optical Society of America
(130.3120) Integrated optics : Integrated optics devices
(230.3120) Optical devices : Integrated optics devices
(230.3990) Optical devices : Micro-optical devices
(230.7370) Optical devices : Waveguides
Tao Yang, Yoshimasa Sugimoto, Sheng Lan, Naoki Ikeda, Yu Tanaka, and Kiyoshi Asakawa, "Transmission properties of coupled-cavity waveguides based on two-dimensional photonic crystals with a triangular lattice of air holes," J. Opt. Soc. Am. B 20, 1922-1926 (2003)