Single-Mode Lasers Based on Cesium Lead Halide Perovskite Submicron Spheres

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Cesium lead halide (CsPbX3) perovskites are promising materials for optoelectronic applications.
• Fabricating stable, high-quality perovskite microcavities is crucial for advanced laser development.

Purpose of the Study:

• To demonstrate a single-mode laser in cesium lead halide perovskite submicron spheres.
• To achieve high performance metrics including low threshold, narrow linewidth, and high quality factor.
• To explore wavelength tunability by controlling material composition and sphere size.

Main Methods:

• Fabrication of all-inorganic CsPbX3 microspheres (0.2-10 μm) using a dual-source chemical vapor deposition method.
• Utilizing whispering gallery resonant modes within the spherical cavities for laser operation.
• Characterizing laser performance, including threshold, linewidth, and quality factor.

Main Results:

• Achieved a single-mode laser operation in CsPbX3 submicron spheres at room temperature.
• Obtained a very narrow linewidth (∼0.09 nm), low threshold (∼0.42 μJ cm⁻²), and high cavity quality factor (∼6100).
• Demonstrated continuous wavelength tuning from 425 nm to 715 nm by adjusting halide composition and sphere size.

Conclusions:

• The synthesized CsPbX3 microspheres enable highly efficient, tunable single-mode lasers.
• Whispering gallery modes in these perovskite microcavities lead to superior laser performance.
• This work presents a viable method for creating widely tunable and miniaturized single-mode lasers.