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)


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
Issue number25
Publication statusPublished - 5 Dec 2011

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