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Flat-top Drop Filter based on a Single Topology Optimized Photonic Crystal Cavity

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Outperforming conventional design concepts, a flat-top drop filter has been designed by applying 3D topology optimization to a single waveguide-coupled L3 photonic crystal cavity. Measurements on the design fabricated in silicon-on-insulator material reveal that the pass-band of the drop channel is flat within 0.44 dB over a wavelength range of 9.7 nm with an insertion loss lower than 0.85 dB.

© 2015 Optical Society of America

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