Radially and azimuthally polarized beams generated by space-variant dielectric subwavelength gratings

Opt Lett. 2002 Mar 1;27(5):285-7. doi: 10.1364/ol.27.000285.


We present a novel method for forming radially and azimuthally polarized beams by using computer-generated subwavelength dielectric gratings. The elements were deposited upon GaAs substrates and produced beams with a polarization purity of 99.2% at a wavelength of 10.6 microm . We have verified the polarization properties with full space-variant polarization analysis and measurement, and we show that such beams have certain vortexlike properties and that they carry angular momentum.