Baida and Van Labeke recently proposed a structure that exhibits a supertransmission of light through an array of nanometric coaxial apertures in a metallic film that has been named an annular aperture array (AAA) [Opt. Commun.209, 17 (2002) ; Phys. Rev. B67, 155314 (2003) ; J. Microsc.213, 140 (2003) ]. We present the first experimental study, to our knowledge, of an AAA structure in the visible region. For technological reasons, the structure under study does not produce a supertransmission of 80% as in Baida and Van Labeke [Opt. Commun.209, 17 (2002) ]. We built the nanostructure and experimentally recorded its far-field spectral response. This transmission shows only one broad band with a maximum around ?=700?nm, giving a maximum efficiency around 17%. A finite-difference time-domain simulation reproduces quite well the obtained transmission spectrum.
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