A few twists regarding the momentum of shaped beams

Gabriel Spalding, Patrick Dahl, Zhengyi Yang, Peter Glynne-Jones, Michael P. Macdonald, Christine Demore, Sandy Cochran

Research output: Contribution to conferencePaper

Abstract

In the acoustic tweezers literature, it is sometimes stated that there would be no radiation pressure in the absence of nonlinearity. In fact, such a circumstance would allow violation of the Second Law of Thermodynamics, an issue we discuss in this talk. In the limit where the Second Law applies, all radiant forms of energy must carry an associated momentum. Shaped beams offer (along with shaped targets) opportunity for discussion of the respective advantages of conservative and non-conservative forces. Commonly in acoustic trapping, conservative, gradient-induced mechanisms (e.g., standing waves) are used to manipulate matter. Such situations are reasonably described in terms of potential energy landscapes, an approach also applied to optics, for applications such as cell sorting [MacDonald et al, Nature 426 (2003)]. No such description is possible for radiation pressure, which is non-conservative, a distinction that is sometimes muddled in the literature, although it was made clear even in early landmark papers.

Original languageEnglish
Number of pages1
DOIs
Publication statusPublished - 2 Nov 2017
Event2017 IEEE International Ultrasonics Symposium, IUS 2017 - Washington, United States
Duration: 6 Sep 20179 Sep 2017

Conference

Conference2017 IEEE International Ultrasonics Symposium, IUS 2017
CountryUnited States
CityWashington
Period6/09/179/09/17

Fingerprint

radiation pressure
nonconservative forces
momentum
landmarks
acoustics
classifying
standing waves
potential energy
trapping
nonlinearity
optics
gradients
thermodynamics
energy

Keywords

  • Acoustic beams
  • Acoustics
  • Optics
  • Astronomy
  • Thermodynamics
  • Potential energy

Cite this

Spalding, G., Dahl, P., Yang, Z., Glynne-Jones, P., Macdonald, M. P., Demore, C., & Cochran, S. (2017). A few twists regarding the momentum of shaped beams. Paper presented at 2017 IEEE International Ultrasonics Symposium, IUS 2017, Washington, United States. https://doi.org/10.1109/ULTSYM.2017.8091958
Spalding, Gabriel ; Dahl, Patrick ; Yang, Zhengyi ; Glynne-Jones, Peter ; Macdonald, Michael P. ; Demore, Christine ; Cochran, Sandy. / A few twists regarding the momentum of shaped beams. Paper presented at 2017 IEEE International Ultrasonics Symposium, IUS 2017, Washington, United States.1 p.
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Spalding, G, Dahl, P, Yang, Z, Glynne-Jones, P, Macdonald, MP, Demore, C & Cochran, S 2017, 'A few twists regarding the momentum of shaped beams' Paper presented at 2017 IEEE International Ultrasonics Symposium, IUS 2017, Washington, United States, 6/09/17 - 9/09/17, . https://doi.org/10.1109/ULTSYM.2017.8091958

A few twists regarding the momentum of shaped beams. / Spalding, Gabriel; Dahl, Patrick; Yang, Zhengyi; Glynne-Jones, Peter; Macdonald, Michael P.; Demore, Christine; Cochran, Sandy.

2017. Paper presented at 2017 IEEE International Ultrasonics Symposium, IUS 2017, Washington, United States.

Research output: Contribution to conferencePaper

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T1 - A few twists regarding the momentum of shaped beams

AU - Spalding, Gabriel

AU - Dahl, Patrick

AU - Yang, Zhengyi

AU - Glynne-Jones, Peter

AU - Macdonald, Michael P.

AU - Demore, Christine

AU - Cochran, Sandy

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KW - Acoustic beams

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KW - Optics

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KW - Thermodynamics

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Spalding G, Dahl P, Yang Z, Glynne-Jones P, Macdonald MP, Demore C et al. A few twists regarding the momentum of shaped beams. 2017. Paper presented at 2017 IEEE International Ultrasonics Symposium, IUS 2017, Washington, United States. https://doi.org/10.1109/ULTSYM.2017.8091958