Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 57: Optomechanics II

Q 57.5: Talk

Thursday, March 26, 2015, 15:30–15:45, P/H1

A scheme for cavity-based 3D optical trapping and cooling of silica nanospheres — •Uroš Delić¹, Marzieh Bathaee², Florian Blaser¹, Nikolai Kiesel¹, Alireza Bahrampour², and Markus Aspelmeyer¹ — ¹Vienna Center for Quantum Technology and Science, Faculty of Physics, University of Vienna, A-1090 Vienna, Austria — ²Department of Physics, Sharif University of Technology Tehran, Iran

Silica nanospheres, optically levitated in a high-finesse cavity, has been proposed as a new optomechanical system which provides exceptional quality factors (10¹¹) when operated in ultra-high vacuum [1]. This would enable cooling of nanosphere center-of-mass (CM) motion close to its ground state and quantum state preparation of a macroscopic object in a room-temperature environment.

Previously, we have demonstrated one-dimensional cavity cooling of CM motion of a trapped nanosphere [2]. Three-dimensional (3D) cooling is a prerequisite to access higher vacuum levels [3] and reach long trapping times [4]. In this talk we propose a scheme for a purely cavity-based 3D trapping and cooling [5]. This promises to stabilize the CM motion at lower pressures and provide cooling of the CM motion in all three dimensions. We will discuss first experimental steps in this direction.

[1] Aspelmeyer, Kippenberg, Marquardt, arXiv:1303.0733 (2013). [2] Kiesel et al., PNAS 110:14180-14185 (2013). [3] Gieseler et al., PRL 109(10):103603 (2012). [4] Koch et al., PRL 105(17): 173003 (2010). [5] Bathaee et al., in preparation