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 R0 of the interface be >1/3 [J. Opt. Soc. A 9, 957 (1992) [CrossRef]  ; Appl. Opt. 53, 7885 (2014) [CrossRef]  ]. However, R0>1/3 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 δ0 for s-polarized light to one of two non-overlapping bands: (a) 0δ0<δ0max and (b) δ0min<δ0180°. These two bands are associated with internal and external reflection, respectively. The limiting phase shifts δ0max and δ0min at the band edges are determined analytically as functions of R0.

© 2015 Optical Society of America

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