Optical Bernoulli forces
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Movassagh_Optical-Bernoulli.pdf
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233.48 KB
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Adobe PDF
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Author(s)
Movassagh, Ramis
Johnson, Steven G.
Date Issued
August 2013
Journal
Physical Review A
Publisher
American Physical Society
Citation
Movassagh, Ramis, and Steven G. Johnson. “Optical Bernoulli forces.” Physical Review A 88, no. 2 (August 2013). © 2013 American Physical Society
Version
Final published version
Abstract
By Bernoulli's law, an increase in the relative speed of a fluid around a body is accompanied by a decrease in the pressure. Therefore, a rotating body in a fluid stream experiences a force perpendicular to the motion of the fluid because of the unequal relative speed of the fluid across its surface. It is well known that light has a constant speed irrespective of the relative motion. Does a rotating body immersed in a stream of photons experience a Bernoulli-like force? We show that, indeed, a rotating dielectric cylinder experiences such a lateral force from an electromagnetic wave. In fact, the sign of the lateral force is the same as that of the fluid-mechanical analog as long as the electric susceptibility is positive (ε>ε[subscript 0]), but for negative-susceptibility materials (e.g., metals) we show that the lateral force is in the opposite direction. Because these results are derived from a classical electromagnetic scattering problem, Mie-resonance enhancements that occur in other scattering phenomena also enhance the lateral force.
MIT Department
Massachusetts Institute of Technology. Department of Mathematics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevA.88.023829
