Brillouin scattering—theory and experiment: tutorial

Wolff, Christian; Smith, Margaret S.; Stiller, Birgit; Poulton, Christopher G.

doi:10.1364/josab.416747

Cited by 49 publications

(17 citation statements)

References 102 publications

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“…Albeit with smaller probability, interaction between photons and phonons can also happen through inelastic scattering in which the photon can either absorb (Anti-Stokes process) or lose (Stokes process) energy to a phonon. Inelastic scattering with acoustic phonons is named "Brillouin scattering", 400,401 while inelastic scattering involving optical phonons is known as "Raman scattering". 402,403 For a diatomic 1D chain allowed to vibrate in a 2D space, four phonon modes exist.…”

Section: Photon−phonon Energy Conversionmentioning

confidence: 99%

Optical Metasurfaces for Energy Conversion

et al. 2022

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Nanostructured surfaces with designed optical functionalities, such as metasurfaces, allow efficient harvesting of light at the nanoscale, enhancing light–matter interactions for a wide variety of material combinations. Exploiting light-driven matter excitations in these artificial materials opens up a new dimension in the conversion and management of energy at the nanoscale. In this review, we outline the impact, opportunities, applications, and challenges of optical metasurfaces in converting the energy of incoming photons into frequency-shifted photons, phonons, and energetic charge carriers. A myriad of opportunities await for the utilization of the converted energy. Here we cover the most pertinent aspects from a fundamental nanoscopic viewpoint all the way to applications.

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Section: Photon−phonon Energy Conversionmentioning

confidence: 99%

Optical Metasurfaces for Energy Conversion

et al. 2022

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“…The Stokes signal is frequency downshifted by the Brillouin frequency shift Ω B /2π and shows a Lorentzian shape. A comprehensive tutorial on Brillouin scattering is found in the work by Wolff et al [24]. The Brillouin frequency shift is described by…”

Section: Brillouin-mandelstam Scattering In Cs2-filled Licofmentioning

confidence: 99%

Exploring extreme thermodynamics in nanoliter volumes through stimulated Brillouin-Mandelstam scattering

Geilen

Popp

Das

et al. 2022

Preprint

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Examining the physical properties of materials - particularly of toxic liquids - under a wide range of thermodynamic states is a challenging problem due to the extreme conditions the material has to be exposed to. Such temperature and pressure regimes, which result in a change of refractive index and sound velocity can be accessed by optoacoustic interactions such as Brillouin-Mandelstam scattering. Here we experimentally demonstrate Brillouin-Mandelstam measurements of nanoliter volumes of liquids in extreme thermodynamic regimes. We use a fully-sealed liquid-core optical fiber containing carbon disulfide; within this waveguide, which exhibits tight optoacoustic confinement and a high Brillouin gain of 32.2 ± 0.8 1/(Wm), we are able to conduct spatially resolved measurements of the Brillouin frequency shift. Knowledge of the local Brillouin response enables us to control the temperature and pressure independently over a wide range. We observe and measure the material properties of the liquid core at very large positive pressures (above 1000 bar), substantial negative pressures (below -300 bar) and we explore the isobaric and isochoric regimes. The extensive thermodynamic control allows the tunability of the Brillouin frequency shift of more than 40% using only minute volumes of liquid. This work opens the way for future studies of liquids under a variety of conventionally hard-to-reach conditions.

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“…A typical optomechanical interaction in such a waveguide system treats a mechanical oscillation with frequency Ω(k), a light field with optical frequency ω(k) and the optomechanical coupling g 0 which refers to the coupling between two photons with wave vectors k S , k p (p, q) and one acoustic phonon with wave vector q(k). The optomechanical coupling can originate from different physical processes such as electrostriction [23] and radiation pressure [24]. Considering the three-wave-mixing optomechanical coupling (usually the dominants one), the system can be described by the Hamiltonian [16,18]:…”

Section: A Waveguide Optomechanical Systemmentioning

confidence: 99%

“…As shown in Fig. 2, there are two points [23] where the phase-matching condition is satisfied when the waveguide is pumped by an optical field with wavevector k p and frequency ω(k p ). These two points refer to the Stokes process/anti-Stokes process with photon wavevector k s/as , photon frequency ω(k s/as ), phonon wavevector q s/as and phonon frequency Ω(q s/as ).…”

Section: A Waveguide Optomechanical Systemmentioning

confidence: 99%

Quantum coherent control in pulsed waveguide optomechanics

Zhang¹,

Zhu²,

Wolff³

et al. 2022

Preprint

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Coherent control of traveling acoustic excitations in a waveguide system is an interesting way to manipulate and transduce classical and quantum information. So far, these interactions, often based on optomechanical resonators or Brillouin scattering, have been studied in the steady-state regime using continuous waves. However, waveguide experiments are often based on optical pump pulses which require treatment in a dynamic framework. In this paper, we present an effective Hamiltonian formalism in the dynamic regime using optical pulses that links waveguide optomechanics and cavity optomechanics, which can be used in the classical and quantum regime including quantum noise. Based on our formalism, a closed solution for coupled-mode equation under the undepleted assumption is provided and we found that the strong coupling regime is already accessible in current Brillouin waveguides by using pulses. We further investigate several possible experiments within waveguide optomechanics, including Brillouin-based coherent transfer, Brillouin cooling, and optoacoustic entanglement.

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Brillouin scattering—theory and experiment: tutorial

Cited by 49 publications

References 102 publications

Optical Metasurfaces for Energy Conversion

Optical Metasurfaces for Energy Conversion

Exploring extreme thermodynamics in nanoliter volumes through stimulated Brillouin-Mandelstam scattering

Quantum coherent control in pulsed waveguide optomechanics

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