Quarter-wave stacks may be designed to reflect both polarizations
of a specific wavelength band at all angles of incidences
(omnidirectional). Expressions are given for both the
omnidirectional band center wavelength and the bandwidth for selected
values of the low- and the high-refractive-index layer values. It
is shown that selecting the low refractive index near 1.45 maximizes
the omnidirectional bandwidth for any value of the high refractive
index. It is also shown that the omnidirectional bandwidth may be
extended by addition of contiguous quarter-wave stacks.
© 1999 Optical Society of America
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