28 September 2007 Fabrication and applications of negative refractive index matermaterials with chiral properties
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Abstract
Realizable artificial medium with negative permittivity, permeability and refractive index are fabricated by introducing inclusions significantly smaller than the wavelengths of excitation into an archival host medium. Negative refractive index media normally posses a small degree of chirality associated with the split-rings. However in order to enhance the chirality of the artificial media, the split rings can be replaced by spirals. Recent work has shown that well controlled chiral media can be fabricated using available semiconductor techniques that have been modified to produce these structures. Specifically the glancing angle deposition technique (GLAD) has been shown to be well suited to producing these types of chiral structures. Novel devices made from metamaterials that also possess chirality are considered. When chiral properties are included in a negative refractive index slab, with n = -1, two rays are refracted in the slab. The distance between the two corresponding focal lines is determined by the magnitude of the chiral parameter. Thus this negative refractive index lens can also be used to measure the chiral parameter. At the focal lines small cross polarized components also exist. Based on the complete model expansion of the field at the chiral-chiral (or free space-chiral) interface it is shown that line sources also excite several species of lateral waves that are associated with total internal reflection. Since the refractive index is assumed to be negative, rays incident upon the chiral slab at the critical angles for total internal reflection, θ1 and θ2, are refracted parallel to the interface in the backward direction, resulting in θR1 and θL1 equal to -90°. Thus the image and the source are on the same side of the negative refractive index chiral slab and the device behaves like a reflector.
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Ezekiel Bahar, Ezekiel Bahar, N. J. Ianno, N. J. Ianno, } "Fabrication and applications of negative refractive index matermaterials with chiral properties", Proc. SPIE 6638, Photonic Metamaterials, 66380H (28 September 2007); doi: 10.1117/12.729628; https://doi.org/10.1117/12.729628
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