Yongduck Jung, Daniel Burt, Lin Zhang, Youngmin Kim, Hyo-Jun Joo, Melvina Chen, Simone Assali, Oussama Moutanabbir, Chuan Seng Tan, Donguk Nam, "Optically pumped low-threshold microdisk lasers on a GeSn-on-insulator substrate with reduced defect density," Photonics Res. 10, 1332 (2022)
- Photonics Research
- Vol. 10, Issue 6, 1332 (2022)
Fig. 1. (a), (b) Cross-sectional TEM images of (a) GeSnOS and (b) GeSnOI substrates. Scale bar, 500 nm. (c) PL spectra from GeSnOI and GeSnOS substrates. The measurement temperature is 4 K.
Fig. 2. (a) Schematic illustration of the microdisk structure fabrication process. (b) Tilted-view SEM image of GeSnOI microdisk. Scale bar, 2 μm.
Fig. 3. (a), (b) Top views of simulated electric field distributions in the (a) GeSnOI and (b) GeSnOS microdisk structures, which achieve high-quality factors of > 8000
Fig. 4. (a), (b) PL spectra from (a) GeSnOI and (b) GeSnOS microdisks at different pump powers. (c), (d) Double-logarithmic L-L curves for (c) GeSnOI and (d) GeSnOS microdisks. Insets: linear L-L curves. (e), (f) FWHMs for (e) GeSnOI and (f) GeSnOS microdisks at different pump powers.
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