Abstract
Subwavelength-scale periodic inhomogeneous structures have been engineered to artificially modulate the refractive index and to create unique anisotropic, nonlinear and dispersive [1-4] characteristics. Such artificial modification of refractive index has been also used for fabrication of diffractive optical elements (DOEs) [5-8]. Recently, it was shown that by controlling the orientation of the subwavelength structures, one could achieve pure phase modulation for a circularly polarized input beam, thus allowing a desired phase value using a binary device. This can be explained by the fact that the circular polarization state is an eigenvector of the rotation matrix.
© 2004 Optical Society of America
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