2. Jul 2019
Cavity cooling of optically levitated nanoparticles: Towards quantum experiments at room temperature
Datum: 2. July 2019 |
11:00 –
12:00
Sprecher:
Uros Delic, Faculty of Physics, University of Vienna
Veranstaltungsort: Heinzel Seminar Room / Office Bldg West (I21.EG.101)
Here we demonstrate a new method of cavity cooling a silica nanosphere based on coherent scattering. An optical tweezer allows for precise positioning of the nanosphere inside an empty optical cavity [2]. In contrast to standard optomechanics, cooling of its motion is performed by cavity-enhanced coherent scattering of the red-detuned optical tweezer. We demonstrate genuine three-dimensional cavity cooling, which also allows for stable levitation in high vacuum [3]. Our observed cooling performance and absence of laser phase noise heating indicates that this new method enables ground state cooling of levitated nanoparticles in our current experiment.
References:
[1] Kiesel, Blaser, Delic et al., PNAS 110: 14180-14185 (2013)
[2] Delic, Grass et al., arXiv:1902.06605 (2019)
[3] Delic et al., Phys. Rev. Lett. 122, 123602 (2019)