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
Lara Pajewski, Riccardo Borghi, Giuseppe Schettini, Fabrizio Frezza, and Massimo Santarsiero, "Design of a Binary Grating with Subwavelength Features that Acts as a Polarizing Beam Splitter," Appl. Opt. 40, 5898-5905 (2001)