Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 15: Poster 1: Quanteninformation, Quanteneffekte, Laserentwicklung, Laseranwendungen, Ultrakurze Pulse, Photonik
Q 15.38: Poster
Montag, 14. März 2011, 16:30–19:30, P1
Dipole force driven mechanical oscillation of a silica nanofiber — •Christian Wuttke, Christian Wagner, and Arno Rauschenbeutel — Technische Universität Wien - Atominstitut, Stadionallee 2, A-1020 Wien
We present experimental results on the excitation of mechanical modes in an optical nanofiber by light-induced dipole forces. The nanofiber has a diameter of 500 nm and is realized as the waist of a tapered optical fiber, fabricated from a standard optical glass fiber in a heat-and-pull process. By sending near infrared light through such a nanofiber, a strong evanescent field builds up in its vicinity.
When a second nanofiber is inserted into this evanescent field, the coupling results in an optical dipole force between the fibers. By periodically modulating the intensity of the light, we excite a mechanical oscillation of the fibers. This oscillation can then be detected by the change of the light field coupling caused by the oscillation. Using this method, we observe mechanical resonances at frequencies of several hundred kHz. We examine the dependence of the mechanical quality factors of the resonances on the pressure of the gas atmosphere surrounding the fibers and find values exceeding 105 for pressures up to the mbar range. This shows that silica nanofibers are interesting devices for quantum optomechanics applications.
Financial support by the ESF (EURYI Award) and the Volkswagen Foundation (Lichtenberg Professorship) is gratefully acknowledged.