Browsing by Subject "Right circularly polarized"

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    Complementary chiral metamaterials with giant optical activity and negative refractive index
    (American Institute of Physics, 2011-04-20) Li, Z.; Alici, K. B.; Colak, E.; Özbay, Ekmel
    A complementary bilayer cross-wire chiral metamaterial is proposed and studied experimentally and numerically. It exhibits giant optical activity and a small circular dichroism. The retrieval results reveal that a negative refractive index is realized for right circularly polarized waves due to the strong chirality. Our numerical results show that the mechanism of the chiral behavior at the resonance of lower frequency can be interpreted as the coupling effects between two sets of mutually twisted virtual magnetic dipoles, while the resonance of higher frequency shows complicated nonlocal features.
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    Polar Policryps diffractive structures generate cylindrical vector beams
    (American Institute of Physics Inc., 2015) Alj, D.; Paladugu, S.; Volpe, G.; Caputo, R.; Umeton, C.
    Local shaping of the polarization state of a light beam is appealing for a number of applications. This can be achieved by employing devices containing birefringent materials. In this article, we present one such enables converting a uniformly circularly polarized beam into a cylindrical vector beam (CVB). This device has been fabricated by exploiting the POLICRYPS (POlymer-LIquid CRYstals-Polymer-Slices) photocuring technique. It is a liquid-crystal-based optical diffraction grating featuring polar symmetry of the director alignment. We have characterized the resulting CVB profile and polarization for the cases of left and right circularly polarized incoming beams.