Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 53: Poster: Quantum Optics and Photonics III

Q 53.65: Poster

Thursday, March 9, 2017, 17:00–19:00, P OG2

Feedback cooling of an optically levitated silica nanosphere in a Michelson-Sagnac interferometer — •Manuel Reisenbauer, Ralf Riedinger, and Markus Aspelmeyer — Universität Wien, Vienna, Austria

A Michelson-Sagnac interferometer is well suited for the position readout of low reflectivity mechanical oscillators [1], as the non-interacting light leaves the interferometer through the bright port, while the reflected light interferes like in a Michelson interferometer, yielding a position dependent phase quadrature in the dark port. We show in a proof-of-principle experiment that by introducing two lenses in the interferometer mode, a dielectric nanoparticle can be trapped optically in one of the standing wave fringes of the Sagnac-mode near the focus. Feedback cooling of the particle is demonstrated, using the radiation pressure of an auxiliary laser beam.