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

Area of Science:

• Photonics
• Materials Science
• Nanotechnology

Background:

• High-quality (high-Q) single-mode lasing is crucial for microscale integrated light sources.
• A key challenge is balancing Q-factor enhancement with light-field localization to boost lasing emission rates.

Purpose of the Study:

• To fabricate a perovskite microcavity integrated with a microlens for three-dimensional light-field tailoring.
• To demonstrate high-performance single-mode lasing using this microfocusing configuration.

Main Methods:

• Fabrication of a zero-dimensional perovskite microcavity.
• Integration with a non-damaging pressed microlens to confine light fields.
• Demonstration of linearly and nonlinearly (two-photon) pumped lasing.

Main Results:

• Achieved a high Q-factor of 16700, high polarization (99.6%), and a Purcell factor of 11.40.
• Demonstrated single-mode lasing under high-repetition pulse pumping.
• Reduced mode volume to ~3.66 μm³ and suppressed losses via 3D light confinement.

Conclusions:

• The microlensing microcavity significantly enhances lasing performance, outperforming most reported perovskite microcavities.
• This approach offers a promising pathway for developing electrically driven on-chip microlasers.