Abstract
Can the reflectivity of a nonlossy slab of arbitrary thickness loaded with a strip grating be identical to that of a plane interface over a wide range of frequencies? A negative response is provided to this question for broadside transverse magnetic polarized incident radiation. It is shown, however, that the strip-grating-loaded slab of thickness h > 0 has the same far-field response as the bare slab of thickness h at all frequencies. These conclusions are at odds with the recent results of Lakhtakia et al. [ J. Opt. Soc. Am. A 3, 1788 ( 1986)] and also emphasize the nonuniqueness of the determination of a scattering structure from measurements, over a wide range of frequencies, of its far-field response to a plane wave at a fixed angle of incidence.
© 1988 Optical Society of America
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