A method is introduced for designing paraxial-domain diffractive elements working over a broad frequency range. The method is based on space-variant manipulation of the state of polarization by form-birefringent binary diffractive structures. It is shown that any scalar phase transmission function can be realized by use of such polarization-modulating structures and that at least in some cases it is even possible to exceed the scalar paraxial-domain upper bounds of diffraction efficiency over a broad frequency band.
© 2004 Optical Society of America
(050.1940) Diffraction and gratings : Diffraction
(050.1970) Diffraction and gratings : Diffractive optics
(230.1360) Optical devices : Beam splitters
(260.1440) Physical optics : Birefringence
(260.5430) Physical optics : Polarization
Hanna Lajunen, Jani Tervo, and Jari Turunen, "High-efficiency broadband diffractive elements based on polarization gratings," Opt. Lett. 29, 803-805 (2004)