Directional emission of stadium-shaped micro-lasers

Mélanie Lebental 1, 2, Jean-Sébastien Lauret 1, Joseph Zyss 1, C. Schmit 2, E. Bogomolny 2

Physical Review A: Atomic, Molecular and Optical Physics 75 (2007) 033806

The far-field emission of two dimensional (2D) stadium-shaped dielectric cavities is investigated. Micro-lasers with such shape present a highly directional emission. We provide experimental evidence of the dependance of the emission directionality on the shape of the stadium, in good agreement with ray numerical simulations. We develop a simple geometrical optics model which permits to explain analytically main observed features. Wave numerical calculations confirm the results.

  • 1. Laboratoire de Photonique Quantique et Moléculaire (LPQM),
    CNRS : UMR8537 – École normale supérieure de Cachan - ENS Cachan
  • 2. Laboratoire de Physique Théorique et Modèles Statistiques (LPTMS),
    CNRS : UMR8626 – Université Paris XI - Paris Sud