Abstract
A robust scheme is proposed to adiabatically couple the light into and out of propagation modes of photonic crystal structures out of photonic bandgap. It is shown that group index plays the main role in reflection from layers with slight variations. This principle is used to design smoothly varying structures to adiabatically match the incident region to the transmission region. The smooth variation is obtained by modifying the size of holes and the aspect ratio of the unit cells in the buffer layers. It is shown that this method is insensitive to incident angle and wavelength and is therefore appropriate as general-purpose input and output buffer stages for dispersion-based applications of photonic crystal such as superprism-based demultiplexing, diffraction-free propagation, diffraction compensation, and dispersion compensation.
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