Design of a Binary Grating with Subwavelength Features that Acts as a Polarizing Beam Splitter.
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.
Pajewski
L
L
Borghi
R
R
Schettini
G
G
Frezza
F
F
Santarsiero
M
M