Open AccessSingle-mode in-gap emission of medium-width photonic crystal waveguides on InP substrate
Author(s) -
X. Checoury,
P. Crozat,
Lourtioz Jm,
C. Cuisin,
E. Derouin,
O. Drisse,
F Poigt,
L. Legouézigou,
O. Legouézigou,
P. Pommereau,
Duan Gh,
Olivier Gauthier-Lafaye,
S. Bonnefont,
D. Mulin,
F. Lozes-Dupuy,
A. Talneau
Publication year - 2005
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.13.006947
Subject(s) - lasing threshold , photonic crystal , optics , materials science , brillouin zone , waveguide , finite difference time domain method , laser , optoelectronics , physics
In this paper, we present a numerical and experimental study of W3-4 photonic crystal (PhC) waveguide lasers fabricated on InP substrate. In such a PhC waveguide, the dispersion curve of the fundamental mode folds in the two-dimensional gap of the triangular lattice. Folding occurs at the Brillouin zone edge as in the case of genuine distributed feedback (DFB) lasers. Single-mode emission is presently observed in both electrical and optical pumping configurations. This behavior is attributed to the different levels of out-of-plane losses experienced by the two DFB mode components. Three-dimensional finite-difference-time-domain calculations are used to finely quantify the quality factors of the waveguide modes. The modal discrimination is shown to be reinforced when lasing occurs far from the conduction band edge. This trend is also predicted for other canonical waveguides in triangular PhCs as for instance W2-3 waveguides.