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  • Title: Monochromatic aberrations in resonant optical elements applied to a focusing multilevel reflectarray.
    Author: Ginn J, Alda J, Gómez-Pedrero JA, Boreman G.
    Journal: Opt Express; 2010 May 24; 18(11):10931-40. PubMed ID: 20588948.
    Abstract:
    The monochromatic aberrations produced by the phase distribution reflected by resonant sub-wavelength metallic structures are studied both analytically and numerically. Even for normal incidence, the angular dependence of the re-radiated wavefront disturbs the overall performance of the reflectarray. This effect is modelled as combination of a linear and a cubic dependence. A complete numerical simulation of a multilevel focusing reflectarray is performed using computational-electromagnetic and physical-optics-propagation methods. A modified Strehl ratio is defined to show the dependence of the focused spot behavior on aperture. The irradiance distribution is dependent on the polarization state. A small-aperture focusing reflectarray has been designed, fabricated, and tested. The irradiance distribution at the focusing plane is compared with the simulated one, showing a good agreement when residual wavefront aberrations are included.
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