Abstract
The approximate method of analysis of grazing-angle scattering (GAS), based on allowance for the diffractional divergence of the scattered wave, is justified and extended to GAS in infinitely wide, slanted, periodic gratings. The analysis has revealed an unusual and strong dependence of the pattern of GAS on small variations of mean structural parameters at the grating boundary. Several times increase of already resonantly large scattered wave amplitudes can be achieved in this case. Sharp resonance-like maximums on the angular dependence of the scattered wave amplitude are predicted inside the grating. The theory is extended to the case of GAS of optical modes guided by a slab with a semi-infinite periodic groove array. Physical interpretation of the obtained results is presented.
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Gramotnev, D.K., Andres, C. Grazing-angle scattering of waves in infinitely wide periodic gratings. Optical and Quantum Electronics 35, 845–863 (2003). https://doi.org/10.1023/A:1024446325395
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DOI: https://doi.org/10.1023/A:1024446325395