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By applying the properties of Fabry-Perot resonance and Rayleigh anomaly, wehave shown that a photonic crystal slab can scatter the light from an incidentplane wave into a diffracted light with a very large reflection or transmissioncoefficient. The enhanced field is either a propagating diffraction order (witha grazing angle of diffraction) or a weakly evanescent order, so it can beparticularly useful for applications requiring an enhanced propagating field(or an enhanced field with a low attenuation). An efficient effective mediumtechnique is developed for the design of the resonant photonic crystal slabs.Numerical simulations have shown that photonic crystal slabs with low indexcontrast, such as the ones found in the cell wall of diatoms, can enhance theintensity of the incident light by four orders of magnitude.

Large field enhancement obtained by combining Fabry-Perot resonance and Rayleigh anomaly in photonic crystal slabs