Kang Jang-Won, Song Bokyung, Liu Wenjing, Park Seong-Ju, Agarwal Ritesh, Cho Chang-Hee
Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, South Korea.
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA.
Sci Adv. 2019 Apr 19;5(4):eaau9338. doi: 10.1126/sciadv.aau9338. eCollection 2019 Apr.
Ultralow-threshold coherent light emitters can be achieved through lasing from exciton-polariton condensates, but this generally requires sophisticated device structures and cryogenic temperatures. Polaritonic nanolasers operating at room temperature lie on the crucial path of related research, not only for the exploration of polariton physics at the nanoscale but also for potential applications in quantum information systems, all-optical logic gates, and ultralow-threshold lasers. However, at present, progress toward room temperature polariton nanolasers has been limited by the thermal instability of excitons and the inherently low quality factors of nanocavities. Here, we demonstrate room temperature polaritonic nanolasers by designing wide-gap semiconductor heterostructure nanocavities to produce thermally stable excitons coupled with nanocavity photons. The resulting mixed states of exciton polaritons with Rabi frequencies of approximately 370 meV enable persistent polariton lasing up to room temperature, facilitating the realization of miniaturized and integrated polariton systems.
通过激子-极化激元凝聚体的激光发射可以实现超低阈值相干发光器，但这通常需要复杂的器件结构和低温。室温下工作的极化激元纳米激光器处于相关研究的关键路径上，不仅用于探索纳米尺度的极化激元物理，还用于量子信息系统、全光逻辑门和超低阈值激光器等潜在应用。然而，目前室温极化激元纳米激光器的进展受到激子热不稳定性和纳米腔固有低品质因数的限制。在这里，我们通过设计宽禁带半导体异质结构纳米腔来产生与纳米腔光子耦合的热稳定激子，从而展示了室温极化激元纳米激光器。由此产生的拉比频率约为370毫电子伏特的激子极化激元混合态能够在室温下实现持续的极化激元激光发射，有助于实现小型化和集成化的极化激元系统。
