Authors

J. Ginn; J. Alda; J. A. Gomez-Pedrero;G. Boreman

Comments

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Abbreviated Journal Title

Opt. Express

Keywords

ARRAY; Optics

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.

Journal Title

Optics Express

Volume

18

Issue/Number

11

Publication Date

1-1-2010

Document Type

Article

Language

English

First Page

10931

Last Page

10940

WOS Identifier

WOS:000278512300002

ISSN

1094-4087

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