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CATEGORIES:Metamaterials Research Group Seminars
SUMMARY:Vortex and field structures in light beams - some
exact solutions - Thomas Philbin\, University of E
xeter
DTSTART:20180221T140000Z
DTEND:20180221T150000Z
UID:TALK2962AT
URL:/talk/index/2962
DESCRIPTION:The propagation of monochromatic light beams is ge
nerally described using the paraxial approximation
\, which gives an accurate description of the most
widely used structured beams (Hermite-Gaussian\,
Laguerre-Gaussian). For beams with strong focussin
g however\, the paraxial approximation breaks down
. Approaches based on diffraction integrals or Fou
rier (k-space) integrals have allowed detailed stu
dy of the structure of non-paraxial beams. Here we
describe an approach that leads to a class of exa
ct analytical solutions for light beams with stron
g focussing. The spatial structure of these soluti
ons is far easier to explore compared to those whi
ch require the evaluation of integrals at each poi
nt. We give detailed pictures of some of these sol
utions\, which contain a rich dynamical structure
of loops of fields lines\, vortices in the time-av
eraged energy flow\, and polarization changes.
LOCATION:Physics West SR1 (103)
CONTACT:Dr Miguel Navarro-Cia
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