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Singular knot bundle in light

Research output: Contribution to journalArticle

  • Danica Sugic
  • Mark R. Dennis
Original languageEnglish
Pages (from-to)1987-1999
Number of pages13
JournalJournal of the Optical Society of America A
Issue number12
Early online date14 Nov 2018
DateSubmitted - 26 Jul 2018
DateAccepted/In press - 12 Oct 2018
DateE-pub ahead of print - 14 Nov 2018
DatePublished (current) - Dec 2018


As the size of an optical vortex knot, imprinted in a coherent light beam, is decreased, nonparaxial effects alter the structure of the knotted optical singularity. For knot structures approaching the scale of wavelength, longitudinal polarization effects become non-negligible, and the electric and magnetic fields differ, leading to intertwined knotted nodal structures in the transverse and longitudinal polarization components, which we call a knot bundle of polarization singularities. We analyze their structure using polynomial beam approximations and numerical diffraction theory. The analysis reveals features of spin–orbit effects and polarization topology in tightly focused geometry, and we propose an experiment to measure this phenomenon.

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