title: Spectroscopy of 3D-trapped particles inside a hollow-core microstructured optical fiber.
abstract: We report on the demonstration of three-dimensional optical trapping inside the core of a hollow-core microstructured optical fiber specifically designed and fabricated for this purpose. Optical trapping was achieved by means of an external tweezers beam incident transversely on the fiber and focused through the fiber cladding. Trapping was achieved for a range of particle sizes from 1 to 5 µm, and manipulation of the particles in three-dimensions through the entire cross-section of the fiber core was demonstrated. Spectroscopy was also performed on single fluorescent particles, with the fluorescence captured and guided in the fiber core. Video tracking methods allowed the optical traps to be characterized and photobleaching of single particles was also observed and characterized.
authors.affiliation: Institute of Photonics and Optical Science (IPOS), School of Physics, The University of Sydney, Sydney, Australia.
authors.forename: Charithra
authors.initials: C
authors.lastname: Rajapakse
authors.forename: Fan
authors.initials: F
authors.lastname: Wang
authors.forename: Tiffany C Y
authors.initials: TC
authors.lastname: Tang
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Reece
authors.forename: Sergio G
authors.initials: SG
authors.lastname: Leon-Saval
authors.forename: Alexander
authors.initials: A
authors.lastname: Argyros
mesh_terms: D004867:Equipment Design; D005336:Fiber Optic Technology; D021621:Imaging, Three-Dimensional; D008027:Light; D008846:Micromanipulation; D016011:Normal Distribution; D055100:Optical Fibers; D052898:Optical Tweezers; D055095:Optics and Photonics; D010316:Particle Size; D038761:Photobleaching; D012031:Refractometry; D013050:Spectrometry, Fluorescence / Q000379:methods; D013053:Spectrophotometry / Q000379:methods; D013057:Spectrum Analysis / Q000295:instrumentation