Hamburg 2009 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 57: Photonik I

Q 57.2: Vortrag

Freitag, 6. März 2009, 10:45–11:00, Audi-A

Detection and Spectroscopy of Preselected Single Nanoparticles Soft-Landed on Optical Fibre Tapers — •Alexander Kuhlicke, Markus Gregor, and Oliver Benson — Humboldt-Universität zu Berlin, Institut für Physik, AG Nano-Optik, Hausvogteiplatz 5-7, 10117 Berlin

Due to their evanescent field, tapered optical fibres offer the opportunity for efficient sensing and probing of nano-sized particles on or near their surface. We developed a method to place single dye-doped polystyrene beads on tapered fibres with the help of a linear Paul-trap and to detect them by the change of the fibre transmission as well as through their fluorescence collected by the fibre.
Our segmented trap geometry allows for high degree of spatial control of the particles inside the trap. It is possible to confine several particles at once, move them within the trap and separate a single particle from the others. The fluorescence spectrum of such a preselected particle can be taken before it is placed on the fibre taper.
This method of controllably storing several and manipulating single particles permits to repeat a landing experiment several times without the necessity to reload the trap and also avoids deposition of unwanted particles on the taper.
We present recent results concerning the detection of single nanoparticles placed on a tapered optical fibre and give an outlook on possible applications of such a system.