Acoustic Radiation Pressure of Plane Compressional Waves

Borgnis, Fritz E.

doi:10.1103/revmodphys.25.653

Cited by 115 publications

(59 citation statements)

References 11 publications

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“…When an incident acoustic wave is hitting an interface, radiation pressure exerts stress on the interface. 20) There is also a quantum mechanical explanation that a phonon carries momentum as a photon does, and this exerts impact on the interface. 21) Experimentally, acoustic radiation pressure was demonstrated to be real in 1939 22) by showing the deformation of the aniline/water interface and the water/CCl 4 interface.…”

Section: Acoustic Radiation Pressurementioning

confidence: 99%

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New Aspects of Crystal Growth of Solid ⁴He Studied by Acoustic Wave

Okuda

Nomura

2008

J. Phys. Soc. Jpn.

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The new aspects of crystal growth in solid 4 He at low temperatures are revealed by manipulating the crystal with a radiation pressure of acoustic waves. The acoustic radiation pressure is generally a tiny nonlinear effect, but it has given unexpected effect on the surface of 4 He owing to the markedly high growth rate of the crystal. Radiation pressure induces crystallization or melting. Owing to the strong temperature dependences of the growth rate of an atomically rough surface, which increases divergingly towards T ¼ 0, and the numerical value of the ratio of the sound velocities in both phases, the crystal melts at high temperatures when the sound wave is applied from the solid side, while it grows at low temperatures under the same conditions. We found a new type of growth mechanism of a c-facet driven by a strong radiation pressure. The growth rate of a c-facet was found to be much higher than the conventional screw-dislocation-mediated mechanism. Theoretical analysis that treated elementary steps as quantum mechanical quasi-particles reproduced the observed important feasures. The superflow around steps was taken into account as the kinetic energy of the steps. Finally, it was demonstrated that the use of radiation pressure enables the creation of negative crystals or superfluid bubbles in the crystal. Various interesting motions and shapes of the negative crystal were observed and interpreted using a simple model.

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Section: Acoustic Radiation Pressurementioning

confidence: 99%

“…20) If the sound intensity is I, the sound pressure amplitude is ÁP, and the density is 1 , E is given by…”

Section: Acoustic Radiation Pressurementioning

confidence: 99%

New Aspects of Crystal Growth of Solid ⁴He Studied by Acoustic Wave

Okuda

Nomura

2008

J. Phys. Soc. Jpn.

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“…According to the concept of acoustic radiation pressure, 7) the effective driving force on the crystal-liquid interface consists of two terms, the first-and second-order terms:…”

Section: )mentioning

confidence: 99%

Facet Growth of ⁴He Crystal Induced by Acoustic Waves

et al. 2006

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Very fast growth of the c-facet of a 4 He crystal was induced by acoustic waves. The growth velocity was larger at lower temperatures and saturated below about 400 mK. The velocity was proportional to the acoustic wave power. This fast growth cannot be explained by the spiral growth mechanism for the known value of the step mobility. We developed a step multiplication model for high-power acoustic waves and found reasonable agreement with the observed temperature and power dependence of the growth velocity.KEYWORDS: quantum solids, superfluid, acoustic radiation pressure, crystal growth, step DOI: 10.1143/JPSJ.75.023601A fundamental problem in crystal growth physics is how fast a facet can grow. In ordinary materials, the facet grows with a spiral growth mechanism well below the roughening transition temperature. 1) Step motion is limited by the diffusion of atoms and/or by the transport of latent heat. When two steps with opposite sign collide, they disappear without any reflection or transmission.Step density cannot increase indefinitely but reaches a steady-state value which is determined by the driving force for the crystallization. Recently, Parshin and Tsymbalenko have proposed a new type of collision of steps in the case of high mobility of steps at a large driving force.2) When high speed-steps collide, the steps pass through each other making another atomic layer on the facet due to the inertia of the liquid accompanying the step motion. This kinematical multiplication of steps makes the step density higher and the growth of the facet faster. Mobility of steps for a 4 He crystal in the superfluid liquid is not limited by the diffusion and can be very high at very low temperatures.3) We observed anomalously fast growth of the c-facet of a 4 He crystal induced by acoustic waves. The fast growth could not be explained by the spiral growth mechanisms and we possibly observed the multiplication of steps.We reported that acoustic waves induce crystallization of 4 He crystals at low temperatures. 4,5) We interpreted that this interface motion was induced by the acoustic radiation pressure. For the small displacement of the interface by a short acoustic wave pulse (1 ms), the acoustic radiation pressure model can explain the growth velocity of the rough and vicinal surfaces reasonably well at low temperatures by taking into account the orientation dependence of the growth coefficients. In this paper, we report the effect of the longer pulse (50 ms) applied to the vicinal surface from the crystal side. The displacement of the interface was much larger and the clear c-facet soon appeared on the top of the upheaval because the growth velocity of the c-facet was smaller than the vicinal surface. This growth velocity of the c-facet was much larger than the value expected from the spiral growth model with known step mobility. Since the pressure oscillation of the applied acoustic wave was large enough to accelerate steps to the velocity of sound, kinematical step multiplication was likely to occur. We constructed a g...

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“…Gaining control over radiation damping forces is interesting in its own right. [3][4][5][6] However, this capability can also develop into a new approach to manage the dynamics of hybrid optomechanical atom-membrane interfaces, 7 where the motion of cold atoms is strongly coupled to the vibration of a micro-mechanical membrane. 8 Controlling the coherent motion of cold atoms via radiation damping, particularly if this control can be performed all-optically as we will demonstrate below, would permit substantial engineering of the mechanical oscillator, including the quantumlimited read-out of its position [9][10][11][12] and the efficient exchange of quantum states among light, the oscillator and cold atoms.…”

Section: Introductionmentioning

confidence: 99%

Radiation damping optical enhancement in cold atoms

Horsley

Artoni

et al. 2013

Light Sci Appl

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The typically tiny effect of radiation damping on a moving body can be amplified to a favorable extent by exploiting the sharp reflectivity slope at one edge of an optically induced stop-band in atoms loaded into an optical lattice. In this paper, this phenomenon is demonstrated for the periodically trapped and coherently driven cold 87 Rb atoms, where radiation damping might be much larger than that anticipated in previous proposals and become comparable with radiation pressure. Such an enhancement could be observed even at speeds of only a few meters per second with less than 1.0% absorption, making radiation damping experimentally accessible.

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Acoustic Radiation Pressure of Plane Compressional Waves

Cited by 115 publications

References 11 publications

New Aspects of Crystal Growth of Solid ⁴He Studied by Acoustic Wave

New Aspects of Crystal Growth of Solid ⁴He Studied by Acoustic Wave

Facet Growth of ⁴He Crystal Induced by Acoustic Waves

Radiation damping optical enhancement in cold atoms

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Acoustic Radiation Pressure of Plane Compressional Waves

Cited by 115 publications

References 11 publications

New Aspects of Crystal Growth of Solid 4He Studied by Acoustic Wave

New Aspects of Crystal Growth of Solid 4He Studied by Acoustic Wave

Facet Growth of 4He Crystal Induced by Acoustic Waves

Radiation damping optical enhancement in cold atoms

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Product

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New Aspects of Crystal Growth of Solid ⁴He Studied by Acoustic Wave

New Aspects of Crystal Growth of Solid ⁴He Studied by Acoustic Wave

Facet Growth of ⁴He Crystal Induced by Acoustic Waves