Nonlinear chiral imaging of subwavelength-sized twisted-cross gold nanodimers

Mikko Huttunen, Godofredo Bautista, Manuel Decker, Stefan Linden, Martin Wegener, Martti Kauranen

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    We perform second-harmonic generation (SHG) microscopy with circularly polarized (CP) light to measure chirality of individual twisted-cross gold nanodimers. The chiral signatures, based on different SHG response for the two CP components of incident light, are clearly visible even with off-resonance excitation. The SHG responses of individual nanodimers are found to vary by about a factor of five. The technique thus has very high sensitivity to the nanoscale deformations of the structure. The chiral signatures of the dimers, however, are found to be more uniform, and the technique is thus able to recognize the handedness of the twisted nanodimers with high reliability.
    Translated title of the contributionNonlinear chiral imaging of subwavelength-sized twisted-cross gold nanodimers
    Original languageEnglish
    Pages (from-to)46-56
    Number of pages11
    JournalOptical Materials Express
    Issue number1
    Publication statusPublished - 22 Apr 2011
    Publication typeA1 Journal article-refereed

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