High Q-Factor Single-Mode Lasing in Inorganic Perovskite Microcavities with Microfocusing Field Confinement

作者：Tian, Shuangshuang; Wang, Qi; Liang, Shuang; Han, Qi; Zhang, Debao; Huang, Zhongmin; Ning, Jiqiang; Mei, Shiliang; Xie, Wei; Zhao, Haibin^*; Wu, Xiang^*; Wang, Jun^*

来源：Nano Letters, 2024, 24(4): 1406-1414.

DOI：10.1021/acs.nanolett.3c04797

• microlens
• photonic lasing
• two-photon pumpedlasing
• high-Q microcavity
• perovskitesemiconductor

The realization of high-Q single-mode lasing on the microscale is significant for the advancement of on-chip integrated light sources. It remains a challenging trade-off between Q-factor enhancement and light-field localization to raise the lasing emission rate. Here, we fabricated a zero-dimensional perovskite microcavity integrated with a nondamage pressed microlens to three-dimensionally tailor the intracavity light field and demonstrated linearly and nonlinearly (two-photon) pumped lasing by this microfocusing configuration. Notably, the microlensing microcavity experimentally achieves a high Q-factor (16700), high polarization (99.6%), and high Purcell factor (11.40) single-mode lasing under high-repetition pulse pumping. Three-dimensional light-field confinement formed by the microlens and plate microcavity simultaneously reduces the mode volume (similar to 3.66 mu m(3)) and suppresses diffraction and transverse walk-off loss, which induces discretization on energy-momentum dispersions and spatial electromagnetic-field distributions. The Q factor and Purcell factor of our lasing come out on top among most of the reported perovskite microcavities, paving a promising avenue toward further studying electrically driven on-chip microlasers.

• 单位
  复旦大学