Ionic Solvent-Assisted MAPbBr₃ Perovskite Film for Two-Photon Pumped Single-Mode Laser

Area of Science:

• Photonics
• Materials Science
• Nanotechnology

Background:

• Miniaturized coherent light sources are crucial for on-chip photonics integration.
• Achieving sub-wavelength scale all-dielectric lasers is challenging due to performance-size trade-offs.
• Thin-film lasers typically require complex cavities for optical feedback.

Purpose of the Study:

• To develop a sub-wavelength scale perovskite thin-film laser.
• To simplify the cavity design for efficient lasing.
• To enhance laser performance through material modification.

Main Methods:

• Fabricated a miniaturized methylammonium lead bromide (MAPbBr3) perovskite thin-film laser at sub-wavelength scale (300 nm).
• Employed a simplified cavity design using an ultraviolet glue layer and quartz glass.
• Enhanced film morphology and gain properties by introducing ionic liquid.

Main Results:

• Achieved stable, low-threshold, single-mode lasing under two-photon excitation.
• Demonstrated a high linear polarization degree of 78.6%.
• Obtained a narrow linewidth of 0.35 nm.

Conclusions:

• Successfully shrunk perovskite thin-film lasers to sub-wavelength scale with an ultrasimplified structure.
• The developed laser provides a facile and versatile platform for integrated optoelectronic devices.
• Enhanced gain properties and simplified cavity design are key to achieving high-performance nanoscale lasers.