Abstract
Using an array of nonlinear ring resonators (, 3, 5, and , 2, 3) coupled to the upper arm of a Mach–Zehnder interferometer (MZI), we have proposed an all-optical switch structure. Using a array, we have shown the possibility of designing an all-optical switching device with a threshold intensity as low as and switching window of . While using arrays, we have achieved switching windows smaller than , at the expense of higher switching thresholds, ranging from 37 to . The whole structure is based on a square lattice photonic crystal of lattice constant , formed by rods of radius in an air background. The linear rods’ refractive index is taken to be the same as that of ; i.e., , whereas the nonlinear rod’s refractive index and Kerr index parameter are taken to be and . The center wavelength at which the nonlinear rings are designed to make the resonance is taken to be in free space.
© 2008 Optical Society of America
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