Abstract
Highly polarization-selective diffractive optical elements for use in
optical interconnection and routing systems have been fabricated by the wet
etching of pairs of calcite substrates and characterized experimentally. We
show that when an index-matching polymer is used to fill the gap between the
two substrates, substrate alignment problems are eliminated and efficiency is
greatly increased. This has resulted in first-order diffraction efficiencies
of 40.5% and polarization contrast ratios of 450:1 for several off-axis
binary-phase elements, allowing these components to be used for practical
applications.
© 1997 Optical Society of America
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