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Diffraction Grating Efficiency Calculations

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Diffraction Grating Efficiency Calculations

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Several techniques have been developed to calculate grating efficiencies, most of which have two characteristics in common: they employ Maxwell’s equations whose boundary conditions are applied at the corrugated grating surface, and their difficulty in implementation varies in rough proportion to their accuracy. In this section only a brief mention of these techniques is provided – more details may be found in Petit, Maystre, and Loewen and Popov.Grating efficiency calculations start with a description of the physical situation: an electromagnetic wave is incident upon a corrugated surface, the periodicity of which allows for a multiplicity of diffracted waves (each in a different direction, corresponding to a unique diffraction order as described in Diffraction Orders). Efficiency calculations seek to determine the distribution of the incident energy into each of the diffraction orders.

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