--------------------
- Demonstration of critical coupling in an active III-nitride microdisk photonic circuit on silicon doi link

Auteur(s): Tabataba-Vakili Farsane, Doyennette L., Brimont C., Guillet T., Rennesson Stephanie, Damilano Benjamin, Frayssinet Eric, Duboz Jean-Yves, Checoury Xavier, Sauvage Sébastien, El Kurdi Moustafa, Semond Fabrice, Gayral Bruno, Boucaud Philippe

(Article) Publié: Scientific Reports, vol. 9 p.18095 (2019)
Texte intégral en Openaccess : openaccess


Ref HAL: hal-02393815_v1
DOI: 10.1038/s41598-019-54416-3
WoS: 000500557100001
Exporter : BibTex | endNote
6 Citations
Résumé:

On-chip microlaser sources in the blue constitute an important building block for complex integrated photonic circuits on silicon. We have developed photonic circuits operating in the blue spectral range based on microdisks and bus waveguides in III-nitride on silicon. We report on the interplay between microdisk-waveguide coupling and its optical properties. We observe critical coupling and phase matching, i.e. the most efficient energy transfer scheme, for very short gap sizes and thin waveguides (g = 45 nm and w = 170 nm) in the spontaneous emission regime. Whispering gallery mode lasing is demonstrated for a wide range of parameters with a strong dependence of the threshold on the loaded quality factor. We show the dependence and high sensitivity of the output signal on the coupling. Lastly, we observe the impact of processing on the tuning of mode resonances due to the very short coupling distances. Such small footprint on-chip integrated microlasers providing maximum energy transfer into a photonic circuit have important potential applications for visible-light communication and lab-on-chip bio-sensors.