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Matrix Fabry–Perot resonance mechanism in high-contrast gratings

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Abstract

We present a simple analytic formalism to explain the unique resonance phenomenon in subwavelength high- contrast gratings (HCG). We show that the resonances are due to strong coupling between two surface-normal waveguide array modes resulting from abrupt and large index contrast. Simple expression for HCG quality factor is derived that agrees with spectral-fitting approaches reported in literature.

© 2011 Optical Society of America

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