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Response of Chiral Sculptured Thin Films to Dipolar Sources

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Dyadic Green functions (DGFs) are formulated, for a chiral sculptured thin film (STF) sandwiched between two vacuous half-spaces, as angular spectrums of propagating and evanescent plane waves. Asymptotic evaluation of the DGFs is carried out to obtain simple far-field expressions. The radiation patterns of dipolar sources held close to the chiral STF are computed and discussed, in relation to the circular Bragg phenomenon that the chosen nanomaterials are known to display on illumination by circularly polarized plane waves.
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Keywords: Circular Bragg phenomenon; Dipolar sources; Dyadic Green functions; Near field; Sculptured thin films

Document Type: Original Article

Affiliations: 1: CATMAS-Computational & Theoretical Materials Science Group, Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16802-6812, USA. E-mail: 2: Department of Physics, The Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2BW, UK

Publication date: 2003-01-01

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