A binary diffractive optical element, acting as a polarizing beam
splitter, is proposed and analyzed. It behaves like a transmissive
blazed grating, working on the first or the second diffraction order,
depending on the polarization state of the incident radiation. The
grating-phase profile required for both polarization states is obtained
by means of suitably sized subwavelength groups etched in an isotropic
dielectric medium. A rigorous electromagnetic analysis of the
grating is presented, and numerical results concerning its performances
in terms of diffraction efficiency as well as frequency and angular
bandwidths are provided.
© 2001 Optical Society of America
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