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Polarization Properties of a CdSe/ZnS and Au Nanoparticle Dimer



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A hybrid CdSe/ZnS quantum dot and gold nanoparticle dimer is assembled using AFM nanomanipulation. The quantum dot acquires a pronounced polarization dependence on the incident excitation light due to the excitation of localized surface plasmons in the gold nanoparticle (see picture). A large polarization contrast ratio beyond the maximum field enhancement is observed and explained quantitatively.