Whispering gallery modes in deformed hexagonal resonators

Marius Grundmann*, Christof P. Dietrich

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Optical resonances in polygonal resonators are due to whispering gallery modes (WGM). We investigate WGM in regular and deformed hexagonal ZnO microwire resonators. Four types of geometries are investigated: regular hexagonal and dodecagonal cross sections, hexagonal cross section elongated for one pair of facets and hexagonal cross section deformed by bending (uniaxial stress). Experimental data on mode energies and angular dispersion are correlated with model calculations and Poincare surfaces of section. Hexagonal (phi=60 degrees), square (phi=45 degrees), triangular (phi=30 degrees), and FabryPerot modes (phi=0 degrees) are observed in the various investigated geometries, phi being the angle of incidence at the facets with respect to the normal direction. Hexagonal WGMs (green, 6-WGM), triangular (red, 3-WGM), and double-triangular (blue, D3-WGM) rays in regular hexagons, elongated hexagons and hexagons deformed by bending. Triangular WGMs are stable modes in all three resonators. Hexagonal modes are not stable in the bent hexagon.

Original languageEnglish
Pages (from-to)871-879
Number of pages9
JournalPhysica Status Solidi. B
Volume249
Issue number5
DOIs
Publication statusPublished - May 2012

Keywords

  • resonators
  • whispering gallery modes
  • zinc oxide
  • ZINC-OXIDE
  • DIRECTIONAL EMISSION
  • MICRODISK LASERS
  • OPTICAL MODES
  • GROWTH
  • SQUARE
  • MICROCAVITIES
  • MICROLASERS
  • NANOWIRES

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