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We devised an approach for realizing add-drop filters. This approach uses strip waveguides to couple light into photonic crystal based resonators. We used silicon on insulator substrate with a 240 nm thick Si layer. Theoretical analysis, simulation and experiments were conducted. We compared the new device to a ring-based add-drop filter and found that for rings with radii smaller than 1.414 µm, our device has significant advantages.

Hybrid add-drop filter based on one-dimensional photonic crystal Fabry-Perot resonator