Laser cooling and control of excitations in superfluid helium

  title={Laser cooling and control of excitations in superfluid helium},
  author={Glen I Harris and David L. McAuslan and Eoin Sheridan and Yauhen P. Sachkou and Christophe Baker and Warwick Paul Bowen},
  journal={Nature Physics},
It takes extreme sensitivity to measure the elementary excitations in liquid helium-4. An optomechanical cavity with a thin film of superfluid inside can be used to both observe and control phonons in real time. 
Superfluid Brillouin optomechanics
An optomechanical system made of an optical cavity filled with superfluid liquid helium provides the means to study phenomena involving different degrees of freedom than those in traditional
Phonon Confinement by the Force of Light
  • Xin He, C. Baker, W. Bowen
  • Physics
    2018 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)
  • 2018
Using superfluid optomechanical system, here we show both that radiation pressure can greatly deform superfluid film, increasing its local thickness by over a factor of 2, and that this generates new
Observation of Coherent Vortex Dynamics in Two-Dimensional Superfluid Helium
Two-dimensional superfluidity and quantum turbulence are emergent phenomena native to various condensed matter systems ranging from ultracold quantum gases to superfluid helium. However, to date,
Detecting a phonon flux in superfluid He4 by a nanomechanical resonator
Nanoscale mechanical resonators are widely utilized to provide high sensitivity force detectors. Here we demonstrate that such high-quality-factor resonators immersed in superfluid He-4 can be
Quantum Optomechanics in a Liquid.
The measurement of the quantum fluctuations of a single acoustic mode in a volume of superfluid He that is coupled to an optical cavity opens the possibility of exploiting the remarkable properties of this material to access new regimes of quantum optomechanics.
Optomechanical Platform for Probing Two-Dimensional Quantum Fluids
In this chapter we present a paradigm of cavity optomechanics with thin films of superfluid helium. Two-dimensional superfluid films offer a number of desirable properties for both optomechanical
Theoretical framework for thin film superfluid optomechanics: towards the quantum regime
Excitations in superfluid helium represent attractive mechanical degrees of freedom for cavity optomechanics schemes. Here we numerically and analytically investigate the properties of optomechanical
Thin film superfluid optomechanics
Excitations in superfluid helium represent attractive mechanical degrees of freedom for cavity optomechanics schemes. Here we numerically and analytically investigate the properties of optomechanical
Optomechanics in superfluid helium coupled to a fiber-based cavity
Presented in this paper are measurements of an optomechanical device in which various acoustic modes of a sample of superfluid helium couple to a fiber-based optical cavity. In contrast with recent
Observation of thermal fluctuations in a superfluid optomechanical system
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


Direct Observation of Pulsed Third Sound Mass Displacement Waves in Unsaturated Superfluid 4He Films
We report direct observation of pulsed third-sound film thickness oscillations in unsaturated superfluid /sup 4/He films using a capacitance technique. Simultaneous measurements of accompanying
Brillouin scattering from superfluid 4He
Brillouin scattering at 90 degrees from thermally excited first sound in superfluid 4He has been measured with a Fabry-Perot etalon and digital scanning. The line shifts confirm that there is no
Near-field cavity optomechanics with nanomechanical oscillators
We use evanescent near-fields of high-Q optical microresonators to extend cavity-optomechanical coupling to nanomechanical oscillators. Pure radiation pressure coupling to SiN nanomechanical strings
An introduction to quantum turbulence
  • W. Vinen
  • Physics
    Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
  • 2008
This paper provides a brief introduction to quantum turbulence in simple superfluids, in which the required rotational motion in the superfluid component is due entirely to the topological defects
Superfluid optomechanics: coupling of a superfluid to a superconducting condensate
We investigate the low loss acoustic motion of superfluid ^4He parametrically coupled to a very low loss, superconducting Nb, TE_(011) microwave resonator, forming a gram-scale, sideband resolved,
Neutron scattering from quantum condensed matter.
Neutron scattering has provided unique insights into the microscopic origin of collective quantum phenomena such as magnetism, superfluidity and superconductivity.
The nonequilibrium thermodynamics of small systems
The interactions of tiny objects with their environments are dominated by thermal fluctuations. Guided by theory and assisted by new micromanipulation tools, scientists have begun to study such
Microphotonic Forces From Superfluid Flow
In cavity optomechanics, radiation pressure and photothermal forces are widely utilized to cool and control micromechanical motion, with applications ranging from precision sensing and quantum
Theory of optomechanical interactions in superfluid He
A general theory is presented to describe optomechanical interactions of acoustic phonons, having extremely long lifetimes in superfluid $^4$He, with optical photons in the medium placed in a