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Experimental and theoretical circular dichroism data for left- and right-handed gold nanoparticle double helices. (a) CD spectra of left-handed (blue) and right-handed (red) gold nanoparticle double helices. Left-handed and right-handed double helices result in vertically mirrored CD signals at 562 nm. (b) CD spectra predicted by the theoretical model exhibit similar bisignate signatures to (a) in the visible region (particle diameter 7 nm). The optical path length is 1 mm.
