Abstract
Abstract 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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