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Effect of the cladding layer on resonance response in guided mode resonance structures and its sensing applications

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Abstract

The resonance properties in a guided mode resonance (GMR) structure having a cladding layer inserted between the subwavelength grating and the high-index film are studied. The presence of the layer results in a significant reduction of the resonance linewidth where multiple-coupling approximations are implemented to describe this behavior. The sensitivity of the resonance wavelength to the change of the layer’s refractive index demonstrates the feasibility of using this configuration as a high resolution GMR-based sensor (up to 1×105 refractive index unit). The improvement is achieved through the waveguide properties with no perturbation of the grating param eters. In this scheme, coupling to a cladding mode increases the sensitivity 32 times that of coupling to a guided mode when using high-index substances. For low-index substances, exciting super mode resonances enhances the sensitivity by a factor of 6 compared to the guided-mode resonance.

© 2011 Optical Society of America

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