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Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
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Room temperature nanocavity laser with interlayer excitons in 2D heterostructures
Yuanda Liu1,2, Hanlin Fang3, Abdullah Rasmita1
1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, Singapore.
Science Advances
|April 30, 2019
Summary
Researchers developed a room temperature interlayer exciton laser using layered 2D materials (MoS2/WSe2). This infrared laser is compatible with silicon photonics, offering new possibilities for coherent light sources.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Optoelectronics
Background:
- Two-dimensional (2D) materials offer unique properties for research and devices.
- Artificial heterostructures enable bandgap engineering and material control.
- Previous excitonic lasers used transition metal dichalcogenides but emitted at intrinsic monolayer bandgaps.
Purpose of the Study:
- To report a room temperature interlayer exciton laser.
- To utilize MoS2/WSe2 heterostructures for laser applications.
- To explore infrared emission compatible with silicon photonics.
Main Methods:
- Fabrication of MoS2/WSe2 heterostructures.
- Characterization of lasing properties, including L-L curves and spectral linewidth.
- Analysis of interlayer exciton dynamics and emission characteristics.
Main Results:
- Demonstrated a room temperature interlayer exciton laser using MoS2/WSe2 heterostructures.
- Observed distinct lasing onset via L-L curve kinks and spectral linewidth collapse.
- Achieved infrared emission, distinct from monolayer intralayer exciton visible emission.
- Leveraged the long lifetime of interlayer excitons to relax cavity requirements.
Conclusions:
- Room temperature interlayer exciton lasers are feasible with 2D heterostructures.
- The infrared emission is compatible with silicon photonics platforms.
- Long exciton lifetimes enable efficient lasing with relaxed cavity constraints.
- This work opens new avenues for tailored coherent light sources on silicon photonics.
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