Abstract

We experimentally investigate the dispersion curve of an integrated silicon-on-insulator coupled-cavity waveguide in a photonic crystal environment using a technique based on far-field imaging. We show that a chain of eight coupled cavities of a moderate Q factor can form a continuous dispersion band characterized by extremely flat dispersion and a group index of 105±20 within a 2.6nm wavelength range. The experimental results are well reproduced by theoretical calculations based on the guided-mode expansion method.

© 2009 Optical Society of America

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