Abstract
The appearance of a reflectance minimum at oblique incidence when unpolarized or circularly polarized light is reflected at a dielectric-conductor interface requires that the normal-incidence intensity reflectance of the interface be [J. Opt. Soc. A 9, 957 (1992) [CrossRef] ; Appl. Opt. 53, 7885 (2014) [CrossRef] ]. However, is only a necessary but insufficient condition for the interface reflectance to exhibit a minimum at non-normal incidence. A second condition, the subject of this study, restricts the normal-incidence reflection phase shift for -polarized light to one of two non-overlapping bands: (a) and (b) . These two bands are associated with internal and external reflection, respectively. The limiting phase shifts and at the band edges are determined analytically as functions of .
© 2015 Optical Society of America
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