Authors
Xiqing Chen, Hancong Li, Zhikai Ma, Wenshuo Dai, Longlong Yang, Sai Yan, Rui Zhu, Hanqing Liu, Haiqiao Ni, Zhichuan Niu, Qihuang Gong, Xiulai Xu
Published in
Nano letters. Jul 13, 2026. Epub Jul 13, 2026.
Abstract
Achieving ultralow-threshold topological lasing remains an important challenge for integrated photonics. We report an ultralow-threshold nanolaser based on a topological Su-Schrieffer-Heeger (SSH) nanobeam interface state with embedded semiconductor quantum dots. By removing the central hole at the SSH interface, the topological cavity mode is preserved, while the quality factor is improved and the small mode volume is maintained. The optimized field profile also enhances cavity-gain coupling, increasing the high-field fraction inside the semiconductor by ∼20%. Experimentally, optimized-interface nanobeam devices exhibit single-mode continuous-wave lasing with a threshold of approximately 640 nW. Under pulsed excitation, single-mode lasing is also observed with a peak incident pump threshold of approximately 62 μW. Power-dependent photon-correlation measurements reveal pronounced near-threshold bunching followed by gradual suppression at higher pump powers, indicating delayed coherence buildup above the threshold.
PMID:
42444046
Bibliographic data and abstract were imported from PubMed on 14 Jul 2026.
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