Long-wavelength InAs/InAlGaAs quantum dot microdisk lasers on InP (001) substrate

作者：Jia, Hui; Yu, Xuezhe; Zhou, Taojie^*; Dear, Calum; Yuan, Jiajing; Tang, Mingchu; Yan, Zhao; Ratiu, Bogdan-Petrin; Li, Qiang; Seeds, Alwyn; Liu, Huiyun; Chen, Siming^*

来源：Applied Physics Letters, 2023, 122(11): 111108.

DOI：10.1063/5.0142391

In this Letter, we present long-wavelength microdisk lasers based on five stacks of self-assembled InAs/InAlGaAs quantum dots as the active medium, which were grown on InP (001) substrate by solid-source molecular beam epitaxy. The 8.4-mu m-diameter quantum dot microdisk laser is operated at room temperature under pulsed optically pumping conditions. Multi-wavelength lasing emissions at similar to 1.6 mu m were achieved with a low lasing threshold of 30 mu W and a quality factor of similar to 1336. The lasing behavior was verified by the "S " shape L-L curve, linewidth narrowing effect, and strong speckle patterns of the collected near field intensity profile. The demonstrated long-wavelength lasers with low threshold and ultracompact footprint can find potential applications in integrated gas detection and highly localized label-free biological and biochemical sensing.

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