Abstract

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

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