Novel dual beam fiber traps using endlessly single-mode photonic crystal fiber

David M. Gherardi, Antonia E. Carruthers, Tomas Cizmar, Robert F. Marchington, Kishan Dholakia

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


    The dual beam fiber trap is an important tool in the field of optical micromanipulation. The characteristics of these traps are governed by the fibers used. Photonic crystal fibers have emerged in recent years and may be engineered to have vastly different properties to conventional fibers. In particular, endlessly single-mode photonic crystal fiber (ESM-PCF) will guide any wavelength of light in a single-mode and is commercially available in core diameters up to 35 µm. By utilising these unique properties, we show that it is possible to create novel dual beam ESM-PCF traps for micron size particles. Firstly, we characterise an ESM-PCF trap when using a near-infrared laser coupled into a 25 µm core fiber when trapping a sample in a square capillary. We calculate the trap stiffness for polymer micro-spheres and show that aside from the expected confining potential, it is possible to create line and repulsive potentials. Interference effects due to the capillary are observed. Secondly, we create a dual wavelength standing wave trap which can selectively move two sizes of particles in an optical conveyor belt. Finally, we use a supercontinuum source to create the first white light dual beam fiber trap and show that the low coherence length of the source results in interference free potentials. Overall PCF has great promise for future studies.

    Original languageEnglish
    Title of host publicationOptical Trapping and Optical Micromanipulation V
    EditorsKishan Dholakia, Gabriel C. Spalding
    Place of PublicationBellingham
    PublisherSPIE-International Society for Optical Engineering
    Number of pages9
    ISBN (Print)9780819472588
    Publication statusPublished - 2008
    EventSPIE Optics+Photonics 2008: Optical Trapping and Optical Micromanipulation V - San Diego Convention Center, San Diego, United States
    Duration: 10 Aug 200813 Aug 2008

    Publication series

    NameProceedings of SPIE
    ISSN (Print)0277-786X


    ConferenceSPIE Optics+Photonics 2008: Optical Trapping and Optical Micromanipulation V
    Abbreviated title
    CountryUnited States
    CitySan Diego
    Internet address


    • Photonic crystal fiber
    • optical conveyor belt
    • supercontinuum
    • standing wave trap
    • dual beam fiber trap
    • optical micromanipulation

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