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Lasing from a Large-Area 2D Material Enabled by a Dual-Resonance Metasurface
Isabel Barth1, Manuel Deckart1, Donato Conteduca1
1School of Physics, Engineering and Technology, University of York, York YO10 5DD, U.K.
ACS Nano
|May 6, 2024
Summary
Large-area tungsten disulfide (WS2) monolayers grown by chemical vapor deposition enable room-temperature nanolasers. These novel WS2 lasers exhibit ultralow thresholds and enhanced coherence, paving the way for practical applications.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Semiconducting transition metal dichalcogenides (TMDs) are promising gain media for nanolasers.
- Existing TMD lasers face limitations in output power and size due to the thin nature and mechanical exfoliation of the active material.
Purpose of the Study:
- To demonstrate room-temperature lasing from a large-area tungsten disulfide (WS2) monolayer.
- To investigate the performance of WS2 monolayer lasers integrated with a dual-resonance dielectric metasurface.
Main Methods:
- Wafer-scale chemical vapor deposition (CVD) for growing large-area WS2 monolayers.
- Integration of WS2 monolayer with a dual-resonance dielectric metasurface with a rectangular lattice.
- Characterization of laser performance, including directionality, output power, and spatial coherence.
Main Results:
- Achieved room-temperature lasing from a large-area WS2 monolayer.
- Demonstrated ultralow threshold operation (below 1 W/cm2) due to enhanced light-matter interaction.
- Observed a coherence length exceeding 30 μm, significantly higher than previously reported for 2D material lasers.
Conclusions:
- CVD-grown WS2 monolayers on dielectric metasurfaces are effective for room-temperature nanolaser applications.
- The enhanced coherence length opens possibilities for advanced photonic integrated circuits.
- This work facilitates the development of real-world applications utilizing 2D material-based lasers.
