Ultracompact resonant filters in photonic crystals

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Journal Article
Optics Letters, 2003, 28 (24), pp. 2452 - 2454
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A novel design for an ultracompact, high-Q notch-rejection filter is presented, and an analytic expression for the transmission properties is derived. This folded directional coupler shares the properties of a Fabry-Perot resonator and a directional coupler. We compare and constrast the device to high-Q Fabry-Perot cavities in photonic crystal waveguides.
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