Abstract
Continuous-wave (CW) operated laser is a key component for photonic chips. It has been highly desired to develop low-threshold, high-efficiency, long-term operational, low-cost and easily integratable CW laser. As excellent optical gain materials, quantum dots (QDs) have been intensively investigated for on-chip CW lasers owing to their high photoluminescence quantum yields, tunable emission wavelengths and easy integration. Base on the difference of preparation processes, QDs can be classified into epitaxial QDs and solution- processed colloidal QDs (CQDs). In this mini-review, we summarize the research progresses of epitaxial III–V semiconductor QD and solution-processed CQD-based CW lasers. The challenges associated with the realization of CQD CW lasers are discussed in detail. In particular, the emerging perovskite-based CW lasers are highlighted. Finally, a short perspective of QD-based CW lasers is presented.
摘要
连续激光器是光子芯片的关键部件. 低阈值、高效率、长寿命、低成本、易集成的连续激光器一直是科学界和工业界追求的目标之一. 量子点具有荧光量子产率高、发光波长可调、易于集成等优点, 是一种优异的激光增益材料. 根据制备工艺的不同, 量子点可分为外延生长的量子点和溶液制备的胶体量子点. 本文综述了使用外延生长方法制备的III-V半导体量子点和胶体量子点连续激光器的研究进展, 详细讨论了胶体量子点实现连续激光所面临的困难和挑战, 总结了钙钛矿连续波激光器研究的进展. 最后, 讨论了量子点连续激光器实现光子芯片集成应用所面临的挑战.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (61722502 and 61705009) and BIT funds.
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Wang L, Zhong H conceived the study and organized the manuscript; Dai G, Deng L contributed to discussion and revised the manuscript.
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The authors declare that they have no conflict of interest.
Lei Wang received his PhD degree of physics in 2017 from Beijing Institute of Technology (BIT). Currently, he is working as a postdoc with Prof. Haizheng Zhong in the School of Materials Science & Engineering at BIT. His projects focus on QD-based laser for photonic and sensor applications.
Haizheng Zhong is a full professor of the School of Materials Science & Engineering at BIT. He joined BIT as an associate professor in 2010 and was promoted to full professor in 2013. His current research interests are in the area of CQDs for photonics and optoelectronics. Since 2019, he has served as a senior editor for The Journal of Physical Chemistry Letters. His recent awards include Beijing Science and Technology (2nd, 2/ 10), IDW 2019 best paper award.
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Wang, L., Dai, G., Deng, L. et al. Progress in semiconductor quantum dots-based continuous-wave laser. Sci. China Mater. 63, 1382–1397 (2020). https://doi.org/10.1007/s40843-020-1336-6
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DOI: https://doi.org/10.1007/s40843-020-1336-6