Journal article · Ahead of Print article · Preprint article
A simple coupled-bloch-mode approach to study active photonic crystal waveguides and lasers
By applying a coupled-Bloch-mode approach, we have derived a simple expression for the transmission properties of photonic crystal (PhC) line-defect waveguides with a complex refractive index perturbation. We have provided physical insights on the coupling mechanism by analyzing the frequency dependence and relative strength of the coupling coefficients.
We have shown the impact of the perturbation on the waveguide dispersion relation and how the gain-induced distributed feedback limits the maximum attainable slow-light enhancement of the gain itself. We have then applied our approach to analyze the threshold behavior of various PhC laser cavities and proved the significant impact of coherent distributed feedback effects in these lasers.
Importantly, our approach also reveals that a structure simply consisting of an active region with zero back reflections from the passive output waveguides can achieve lasing oscillation with reasonable threshold gain.
Language: | English |
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Publisher: | IEEE |
Year: | 2019 |
Pages: | 1-1 |
ISSN: | 07921233 , 1077260x and 15584542 |
Types: | Journal article , Ahead of Print article and Preprint article |
DOI: | 10.1109/JSTQE.2019.2922377 |
ORCIDs: | Mørk, Jesper |