Near-field light localization using subwavelength apertures incorporated with metamaterials

D Ates, AO Cakmak, E Ozbay - Optics Communications, 2012 - Elsevier
Optics Communications, 2012Elsevier
We report strong near-field electromagnetic localization by using subwavelength apertures
and metamaterials that operate at microwave frequencies. We designed split ring resonators
with distinct configurations in order to obtain extraordinary transmission results. Furthermore,
we analyzed the field localization and focusing characteristics of the transmitted evanescent
waves. The employed metamaterial configurations yielded an improvement on the
transmission efficiency on the order of 27dB and 50dB for the deep subwavelength …
We report strong near-field electromagnetic localization by using subwavelength apertures and metamaterials that operate at microwave frequencies. We designed split ring resonators with distinct configurations in order to obtain extraordinary transmission results. Furthermore, we analyzed the field localization and focusing characteristics of the transmitted evanescent waves. The employed metamaterial configurations yielded an improvement on the transmission efficiency on the order of 27dB and 50dB for the deep subwavelength apertures. The metamaterial loaded apertures are considered as a total system that offered spot size conversion ratios as high as 7.12 and 9.11 for the corresponding metamaterial configurations. The proposed system is shown to intensify the electric fields of the source located in the near-field. It also narrows down the electromagnetic waves such that a full width at half maximum value of λ/29 is obtained.
Elsevier
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