Enhanced Circular Dichroism of Gold Bilayered Slit Arrays Embedded with Rectangular Holes
Gold bilayered slit arrays with rectangular holes embedded into the metal surface are designed to enhance the circular dichroism (CD) effect of gold bilayered slit arrays. The rectangular holes in these arrays block electric currents and generate localized surface plasmons around these holes, thereby strengthening the CD effect. The CD enhancement factor depends strongly on the rotational angle and the structural parameters of the rectangular holes; this factor can be enhanced further by drilling two additional rectangular holes into the metal surfaces of the arrays. These results help facilitate the design of chiral structures to produce a strong CD effect and large electric fields.
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Document Type: Research Article
Affiliations: School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710062, China
Publication date: 2017-01-01
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