High <i>Q</i>-Factor Single-Mode Lasing in Inorganic Perovskite Microcavities with Microfocusing Field Confinement.
basic_science · Level V
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- Record sourced from PubMed, PMID 38227806.
- Also identified by DOI 10.1021/acs.nanolett.3c04797.
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Abstract
The realization of high-<i>Q</i> single-mode lasing on the microscale is significant for the advancement of on-chip integrated light sources. It remains a challenging trade-off between <i>Q</i>-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 <i>Q</i>-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 (∼3.66 μm<sup>3</sup>) and suppresses diffraction and transverse walk-off loss, which induces discretization on energy-momentum dispersions and spatial electromagnetic-field distributions. The <i>Q</i> 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.