2026-06-28T10:09:29Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/449882023-08-27T13:22:08Zcom_20.500.14352_14col_20.500.14352_15

Monochromatic aberrations in resonant optical elements applied to a focusing multilevel reflectarray Ginn, James Alda, Javier Gómez Pedrero, José Antonio Boreman, Glenn 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. 2023-06-20T04:09:44Z 2023-06-20T04:09:44Z 2023-06-20T04:09:44Z 2010-05 journal article https://hdl.handle.net/20.500.14352/44988 1094-4087 10.1364/OE.18.010931 eng TEC2006-01882 ENE2009-14340-C02-01 open access OSA