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Mechanical Evidence of the Orbital Angular Momentum to Energy Ratio of Vortex Beams

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Mechanical Evidence of the Orbital Angular Momentum to Energy Ratio of Vortex Beams. / Demore, Christine E. M.; Yang, Zhengyi; Volovick, Alexander; Cochran, Sandy; MacDonald, Michael P.; Spalding, Gabriel C.

In: Physical Review Letters, Vol. 108, No. 19, 194301, 2012, p. -.

Research output: Contribution to journalArticle

Harvard

Demore, CEM, Yang, Z, Volovick, A, Cochran, S, MacDonald, MP & Spalding, GC 2012, 'Mechanical Evidence of the Orbital Angular Momentum to Energy Ratio of Vortex Beams' Physical Review Letters, vol 108, no. 19, 194301, pp. -.

APA

Demore, C. E. M., Yang, Z., Volovick, A., Cochran, S., MacDonald, M. P., & Spalding, G. C. (2012). Mechanical Evidence of the Orbital Angular Momentum to Energy Ratio of Vortex Beams. Physical Review Letters, 108(19), -[194301]doi: 10.1103/PhysRevLett.108.194301

Vancouver

Demore CEM, Yang Z, Volovick A, Cochran S, MacDonald MP, Spalding GC. Mechanical Evidence of the Orbital Angular Momentum to Energy Ratio of Vortex Beams. Physical Review Letters. 2012;108(19):-. 194301.

Author

Demore, Christine E. M.; Yang, Zhengyi; Volovick, Alexander; Cochran, Sandy; MacDonald, Michael P.; Spalding, Gabriel C. / Mechanical Evidence of the Orbital Angular Momentum to Energy Ratio of Vortex Beams.

In: Physical Review Letters, Vol. 108, No. 19, 194301, 2012, p. -.

Research output: Contribution to journalArticle

Bibtex - Download

@article{44bd3cd0d08b4691b07ca945f21490f4,
title = "Mechanical Evidence of the Orbital Angular Momentum to Energy Ratio of Vortex Beams",
author = "Demore, {Christine E. M.} and Zhengyi Yang and Alexander Volovick and Sandy Cochran and MacDonald, {Michael P.} and Spalding, {Gabriel C.}",
year = "2012",
volume = "108",
number = "19",
pages = "--",
journal = "Physical Review Letters",
issn = "0031-9007",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Mechanical Evidence of the Orbital Angular Momentum to Energy Ratio of Vortex Beams

A1 - Demore,Christine E. M.

A1 - Yang,Zhengyi

A1 - Volovick,Alexander

A1 - Cochran,Sandy

A1 - MacDonald,Michael P.

A1 - Spalding,Gabriel C.

AU - Demore,Christine E. M.

AU - Yang,Zhengyi

AU - Volovick,Alexander

AU - Cochran,Sandy

AU - MacDonald,Michael P.

AU - Spalding,Gabriel C.

PY - 2012

Y1 - 2012

N2 - We measure, in a single experiment, both the radiation pressure and the torque due to a wide variety of propagating acoustic vortex beams. The results validate, for the first time directly, the theoretically predicted ratio of the orbital angular momentum to linear momentum in a propagating beam. We experimentally determine this ratio using simultaneous measurements of both the levitation force and the torque on an acoustic absorber exerted by a broad range of helical ultrasonic beams produced by a 1000-element matrix transducer array. In general, beams with helical phase fronts have been shown to contain orbital angular momentum as the result of the azimuthal component of the Poynting vector around the propagation axis. Theory predicts that for both optical and acoustic helical beams the ratio of the angular momentum current of the beam to the power should be given by the ratio of the beam’s topological charge to its angular frequency. This direct experimental observation that the ratio of the torque to power does convincingly match the expected value (given by the topological charge to angular frequency ratio of the beam) is a fundamental result.<br/><br/>© 2012 American Physical Society<br/><br/>

AB - We measure, in a single experiment, both the radiation pressure and the torque due to a wide variety of propagating acoustic vortex beams. The results validate, for the first time directly, the theoretically predicted ratio of the orbital angular momentum to linear momentum in a propagating beam. We experimentally determine this ratio using simultaneous measurements of both the levitation force and the torque on an acoustic absorber exerted by a broad range of helical ultrasonic beams produced by a 1000-element matrix transducer array. In general, beams with helical phase fronts have been shown to contain orbital angular momentum as the result of the azimuthal component of the Poynting vector around the propagation axis. Theory predicts that for both optical and acoustic helical beams the ratio of the angular momentum current of the beam to the power should be given by the ratio of the beam’s topological charge to its angular frequency. This direct experimental observation that the ratio of the torque to power does convincingly match the expected value (given by the topological charge to angular frequency ratio of the beam) is a fundamental result.<br/><br/>© 2012 American Physical Society<br/><br/>

U2 - 10.1103/PhysRevLett.108.194301

DO - 10.1103/PhysRevLett.108.194301

M1 - Article

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 19

VL - 108

SP - -

ER -

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