Dark-field optical tweezers for nanometrology of metallic nanoparticles

Kellie Pearce, Fan Wang, Peter J. Reece*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    25 Citations (Scopus)

    Abstract

    Applications of metallic nanoparticles are based on their strongly size-dependent optical properties. We present a method for combining optical tweezers with dark field microscopy that allows measurement of localised surface plasmon resonance (LSPR) spectra on single isolated nanoparticles without compromising the strength of the optical trap. Using this spectroscopic information in combination with measurements of trap stiffness and hydrodynamic drag, allows us to determine the dimensions of the trapped nanoparticles. A relationship is found between the measured diameters of the particles and the peak wavelengths of their spectra. Using this method we may also resolve complex spectra of particle aggregation and interactions within the tweezers.

    Original languageEnglish
    Pages (from-to)25559-25569
    Number of pages11
    JournalOptics Express
    Volume19
    Issue number25
    Publication statusPublished - 5 Dec 2011

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