Ms. Anna Kashkanova Profile

Anna Kashkanova

at Max-Planck-Institut für die Physik des Lichts

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Proceedings Article | 20 February 2017 Presentation + Paper

Observation of thermal fluctuations in a superfluid optomechanical system

A. Kashkanova, A. Shkarin, C. Brown, N. Flowers-Jacobs, L. Childress, S. Hoch, L. Hohmann, K. Ott, S. Garcia, J. Reichel, J. G. E. Harris

Proceedings Volume 10116, 101160Q (2017) https://doi.org/10.1117/12.2252356

KEYWORDS: Helium, Phonons, Solids, Mirrors, Acoustics, Beam controllers, Oscillators, Liquids, Optical amplifiers, Photons

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In cavity optomechanics the state of a mechanical element can be manipulated by interfacing it with light via radiation pressure, electrostriction, or related phenomena. The majority of mechanical elements employed in optomechanical systems to date are solid objects (membranes, nanowires, mirrors, etc); however fluids can also be used as a mechanical element. Compared to solids, fluids have an advantage: they readily achieve precise alignment with the optical cavity, as the fluid can conformally fill or coat the optical cavity. However, almost all optomechanical systems need to be cooled to sub-Kelvin temperatures in order for quantum effects to be observed. Liquid helium is the only fluid that doesn't solidify under its own pressure at these temperatures. Additionally, helium has almost no optical absorption, high thermal conductivity and very low acoustic loss at cryogenic temperatures. We have developed an optomechanical system in which the mechanical mode is a standing density wave in superfluid helium inside a 70 μm long Fabry-Perot cavity. The optical mode is also a mode of the same cavity. Thus, the system is completely self-aligned. In this system, we used electrostriction to drive the mechanical mode with light by modulating the optical intensity. We also observed the mode's undriven Brownian motion and from that extracted it mean phonon number. We measured phonon number as low as n_ac=11. The optomechanical effects of optical spring and optical damping were observed, and agreed well with the predictions of conventional optomechanical theory.

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