Vertically Coupled Microdisk Resonators Using AlGaAs/AlOx Technology
Résumé
In this letter, we report the first experimental demonstration of micro-disk resonators that are vertically-coupled to their buried access waveguides on III-V semiconductor epitaxial structures using an original fabrication process. The here-proposed and validated three-dimensional integration scheme exploits selective lateral thermal oxidation of aluminium-rich AlGaAs layers. Compared to the previously reported processing techniques, this new scheme is simpler as it does not require any planarization or substrate transfer steps. As a proof-of-principle demonstration of this approach, 250 µm-diameter micro-disk devices exhibiting quality factor reaching ~8500 have been successfully fabricated.
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