ArticleNano letters2026
Lasing from SOI-Integrated GaAsSb Nanowires via Resonator-Driven Optical Feedback.
Article in Nano letters, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Silicon photonic integrated circuits critically depend on compact on-chip light sources, for which nanowire (NW) lasers are an attractive solution. However, their practical implementation is often limited by broad emission line widths and poor frequency stability resulting from weak optical feedback. Here, we integrate individual GaAsSb NWs by transfer-printing onto silicon-on-insulator (SOI) racetrack resonators to realize optical feedback at silicon-transparent wavelengths. Finite-difference-time-domain simulations reveal efficient coupling between the hybrid NW-waveguide mode and the fundamental TE resonator mode, with calculated cavity Q factors exceeding 104. Experimentally, we observe feedback-induced lasing emission at a low threshold (Pth) of 8.6 ± 1.8 μJ/cm2. Compared to identical NW lasers without SOI resonator, the line width is reduced by more than a factor of 4 at 3Pth and remains stable below 1.8 meV up to 5Pth. Our results demonstrate NW-based light sources on SOI and show that tailored resonator designs enable improved line width control and frequency stabilization.
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