Near-field light localization using subwavelength apertures incorporated with metamaterials
Date
2012-03-12Source Title
Optics Communications
Print ISSN
0030-4018
Publisher
Elsevier
Volume
285
Issue
16
Pages
3390 - 3396
Language
English
Type
ArticleItem Usage Stats
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Abstract
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 27 dB and 50 dB 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.
Keywords
Diffraction, grating and aperturesElectromagnetic wave transmission
Metamaterials
Resonators
Conversion ratio
Electromagnetic localization
Evanescent wave
Extraordinary transmission
Field localization
Light localization
Near-field
Split ring resonator
Spot sizes
Subwavelength apertures
Transmission efficiency
Electric fields
Electromagnetic wave transmission
Electromagnetic waves
Resonators
Metamaterials