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Title: Extending geometrical optics: A Lagrangian theory for vector waves

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4977537· OSTI ID:1367374
ORCiD logo [1];  [2]
  1. Princeton Univ., Princeton, NJ (United States)
  2. Princeton Univ., Princeton, NJ (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Even when neglecting diffraction effects, the well-known equations of geometrical optics (GO) are not entirely accurate. Traditional GO treats wave rays as classical particles, which are completely described by their coordinates and momenta, but vector-wave rays have another degree of freedom, namely, their polarization. The polarization degree of freedom manifests itself as an effective (classical) “wave spin” that can be assigned to rays and can affect the wave dynamics accordingly. A well-known manifestation of polarization dynamics is mode conversion, which is the linear exchange of quanta between different wave modes and can be interpreted as a rotation of the wave spin. Another, less-known polarization effect is the polarization-driven bending of ray trajectories. Here, this work presents an extension and reformulation of GO as a first-principle Lagrangian theory, whose effective Hamiltonian governs the aforementioned polarization phenomena simultaneously. As an example, the theory is applied to describe the polarization-driven divergence of right-hand and left-hand circularly polarized electromagnetic waves in weakly magnetized plasma.

Research Organization:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
No. 32-CFR-168a; NA0002948; AC02-09CH11466
OSTI ID:
1367374
Alternate ID(s):
OSTI ID: 1348029
Journal Information:
Physics of Plasmas, Vol. 24, Issue 5; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

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Cited By (3)

Quasioptical modeling of wave beams with and without mode conversion. I. Basic theory journal July 2019
Quasioptical modeling of wave beams with and without mode conversion. II. Numerical simulations of single-mode beams journal July 2019
Quasioptical modeling of wave beams with and without mode conversion. III. Numerical simulations of mode-converting beams journal July 2019

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