Abstract
We propose a novel design for a photonic crystal waveguide coupler, which uses elliptical shaped rods with refractive index equal to 3.4 arranged in square lattice. We investigate the performance of slow light in this photonic crystal coupler. By providing a slow-light region using elliptical cells, a coupling length of just 2.58μm is achieved at optical wavelength. This is extremely small coupling length then previously reported. The proposed structure would offer significant potential for novel compact high-speed optical signal processing devices.
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