Light transmission through metallic two-dimensional arrays of compound coaxial structures with central and annular apertures: A charge oscillation picture

Abstract

We investigate the transmission characteristics of metallic film perforated with a two-dimensional array of compound coaxial structures with central and annular apertures by using a charge oscillation picture. It is found that the transmission peak mainly resulted from the resonance of the central apertures (annular apertures) in such structure exhibits changes in position and intensity in comparison with that in the corresponding structure of aperture array (annular-aperture array) due to the effect of the oscillating charges appearing near the annular apertures (central apertures) on the transmission peak. The transmission peak corresponding to the resonance of the central apertures (annular apertures) can be tuned by changing not only the geometrical parameters of the central apertures (annular apertures) but also the sizes of the annular apertures (central apertures). Our results may be utilized to control the electromagnetic wave in subwavelength optics.