Tensile-strained germanium microdisks with circular Bragg reflectors

We demonstrate the combination of germanium microdisks tensily strained by silicon nitride layers and circular Bragg reflectors. The microdisks with suspended lateral Bragg reflectors form a cavity with quality factors up to 2000 around 2 μm. This represents a key feature to achieve a microlaser wit...

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Bibliographic Details
Published in:Applied physics letters 2016-02, Vol.108 (9)
Main Authors: El Kurdi, M., Prost, M., Ghrib, A., Elbaz, A., Sauvage, S., Checoury, X., Beaudoin, G., Sagnes, I., Picardi, G., Ossikovski, R., Boeuf, F., Boucaud, P.
Format: Article
Language:English
Subjects:
Applied physics
Bragg reflectors
Continuous radiation
Q factors
Silicon nitride
Tensile strain
Wave excitation
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Summary:We demonstrate the combination of germanium microdisks tensily strained by silicon nitride layers and circular Bragg reflectors. The microdisks with suspended lateral Bragg reflectors form a cavity with quality factors up to 2000 around 2 μm. This represents a key feature to achieve a microlaser with a quasi-direct band gap germanium under a 1.6% biaxial tensile strain. We show that lowering the temperature significantly improves the quality factor of the quasi-radial modes. Linewidth narrowing is observed in a range of weak continuous wave excitation powers. We finally discuss the requirements to achieve lasing with these kind of structures.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4942891