Directional Lasing from Nanopatterned Halide Perovskite Nanowire

Area of Science:

• Nanophotonics
• Materials Science
• Laser Physics

Background:

• Halide perovskite nanowires offer low-threshold lasing across the visible spectrum at room temperature.
• Current limitations include poor control over emission directivity due to subwavelength facets acting as point sources.

Purpose of the Study:

• To achieve directional lasing from single perovskite nanowires.
• To enhance control over light emission and improve laser performance.

Main Methods:

• Imprinting a nanograting onto a cesium lead bromide (CsPbBr3) perovskite nanowire surface.
• Utilizing high-throughput laser ablation for nanopatterning, preserving material luminescent properties.

Main Results:

• Achieved directional lasing with a narrow divergence angle of approximately 2°.
• Laser ablation method preserved material properties, unlike conventional lithography.
• Nanopatterning reduced lasing modes and increased the quality factor of remaining modes by twofold.

Conclusions:

• Nanograting imprinting on perovskite nanowires enables directional lasing.
• Laser ablation is a suitable method for processing these sensitive materials.
• The technique enhances laser performance metrics like directivity and quality factor.