Journal article

Strong chiral optical response from planar arrays of subwavelength metallic structures supporting surface plasmon resonances

F Eftekhari, TJ Davis

Physical Review B | AMER PHYSICAL SOC | Published : 2012


A strong differential response in the scattering of left and right circularly polarized light from surface plasmons in planar metal nanostructures is investigated theoretically and experimentally. We show that a strong chiral optical response can be obtained by an interference effect arising from a combination of resonance phase shifts in the metal structures and phase shifts associated with the rotation of the electric field vector. The effect is modeled using an analytical theory of localized surface plasmon resonances which predicts a maximum in the chiral response when the nanostructure exhibits at least two resonant modes, separated in frequency by Γ/√3, where Γ is the FWHM of the reson..

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University of Melbourne Researchers