Optical sorting of gold nanoparticles based on the red-shift of plasmon resonance

Martin Ploschner, Tomas Cizmar, Michael Mazilu, Andrea Di Falco, Kishan Dholakia

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    We present an experimental technique allowing size-based all-optical sorting of gold nanoparticles. The technique is based on the red-shift of plasmon resonance, due to retardation effects, with increasing particle size. As a result, smaller gold nanoparticles are influenced strongly by shorter wavelengths whereas larger gold nanoparticles are influenced more strongly by longer wavelengths. We utilise this retardation effect and realize sorting in a system of two counter-propagating evanescent waves, each at different wavelengths that selectively guide nanoparticles of different sizes in opposite directions. We validate this concept by demonstrating bidirectional sorting of gold nanoparticles of either 150 or 130 nm in diameter from those of 100 nm in diameter within a mixture.

    Original languageEnglish
    Title of host publicationOptical Trapping and Optical Micromanipulation IX
    EditorsKishan Dholakia, Gabriel C. Spalding
    Place of PublicationBellingham
    PublisherSPIE-International Society for Optical Engineering
    Number of pages8
    ISBN (Print)9780819491756
    DOIs
    Publication statusPublished - 2012
    EventSPIE Optics+Photonics 2012: Optical Trapping and Optical Micromanipulation IX - San Diego Convention Center, San Diego, United States
    Duration: 12 Aug 201216 Aug 2012
    http://spie.org/x90258.xml

    Publication series

    NameProceedings of SPIE
    PublisherSPIE-International Society for Optical Engineering
    Volume8458
    ISSN (Print)0277-786X

    Conference

    ConferenceSPIE Optics+Photonics 2012: Optical Trapping and Optical Micromanipulation IX
    CountryUnited States
    CitySan Diego
    Period12/08/1216/08/12
    Internet address

    Keywords

    • CHROMATOGRAPHY
    • MANIPULATION
    • Optical sorting
    • SHAPE
    • Optical manipulation
    • SIZE
    • Counter-propagating geometry
    • Plasmon resonance
    • Evanescent field
    • Gold nanoparticle

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