Enhanced Nonradiative Charge Recombination in Microfiber-Based Bismuthene.

Area of Science:

• Materials Science
• Photonics
• Quantum Physics

Background:

• Two-dimensional (2D) materials are crucial as saturable absorbers in ultrafast fiber lasers.
• The atomic-scale interactions between 2D materials and fiber substrates remain poorly understood.
• The influence of fiber substrates on carrier dynamics in 2D materials for photonics applications requires investigation.

Purpose of the Study:

• To elucidate the role of the fiber substrate in ultrafast photonics.
• To understand how fiber substrates affect carrier dynamics in 2D materials.
• To explore the potential of bismuthene on α-quartz for passive mode-locking fiber lasers.

Main Methods:

• Theoretical investigation of bismuthene on α-quartz.
• Experimental analysis using transient absorption spectroscopy.
• Fabrication and testing of a passive mode-locking fiber laser incorporating bismuthene.

Main Results:

• Theoretical calculations predict accelerated nonradiative electron-hole recombination in bismuthene due to the α-quartz substrate.
• Transient absorption spectra confirm that the substrate significantly influences the carrier dynamics of bismuthene.
• Bismuthene on α-quartz demonstrates potential for passive mode-locking in ultrafast fiber lasers.

Conclusions:

• The α-quartz substrate plays a critical role in modulating the carrier dynamics of bismuthene.
• Substrate engineering offers a novel approach to tune the performance of 2D material-based ultrafast photonics.
• This study provides new insights into optimizing ultrafast mode-locking fiber lasers through substrate interactions.