The corner effect in hexagonal whispering gallery microresonators

C. P. Dietrich*, M. Lange, T. Boentgen, M. Grundmann

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Hexagonal microresonators were investigated regarding the influence of the nanometer scale geometry of their corners on light out-coupling, mode quality factor, and lasing threshold of whispering gallery modes (WGMs). For this purpose, ZnO microwires with hexagonal cross section grown by carbothermal vapor-phase transport were fabricated. It turned out that their corners can either be sharp (curvature radius r(C) <10 nm) or be blunt (r(C) approximate to 400 nm). Blunt corners enhance light out-coupling of WGM in the low-excitation regime but otherwise increase mode linewidth. Sharp corners hinder light out-coupling at low excitations leading to long cavity photon lifetimes and facilitating room-temperature WGM lasing at lowest reported lasing thresholds of 73 kW/cm(2). (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4757572]

Original languageEnglish
Article number141116
Number of pages5
JournalApplied Physics Letters
Volume101
Issue number14
DOIs
Publication statusPublished - 1 Oct 2012

Keywords

  • MICRODISK LASERS
  • MODE
  • RESONATORS
  • EMISSION
  • FIBER

Fingerprint

Dive into the research topics of 'The corner effect in hexagonal whispering gallery microresonators'. Together they form a unique fingerprint.

Cite this