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Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication
Published on: November 28, 2017
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Emergent Optical Resonances in Atomically Phase-Patterned Semiconducting Monolayers of WS2
John M Woods1, Saroj B Chand1, Enrique Mejia1
1Photonics Initiative, Advanced Science Research Center, City University of New York, New York, New York 10031, United States.
ACS Photonics
|September 23, 2024
Summary
Researchers precisely controlled light-matter interactions in 2D semiconductors. Atomic manipulation created new optical resonances, enabling stronger light absorption and emission for advanced photonics and quantum technologies.
Area of Science:
- Photonics and Quantum Technology
- Materials Science
- Condensed Matter Physics
Background:
- Atomic-scale control of light-matter interactions is crucial for advanced photonics and quantum technologies.
- Two-dimensional (2D) semiconductors offer unique properties for light manipulation due to their thinness and photophysics.
- Achieving precise control over optical properties at the atomic level remains a significant challenge.
Purpose of the Study:
- To demonstrate the generation of novel optical resonances in 2D semiconductors through atomic-scale structural engineering.
- To investigate the impact of polymorphic structures on the photophysical properties of 2D materials.
- To explore the potential of atomic manipulation for creating new light-harvesting and exciton-based photonic devices.
Main Methods:
- Theoretical prediction of electronic band structures in engineered 2D semiconductor heterostructures.
- Experimental fabrication of durable polymorphic structures within 2D semiconductor matrices.
- Characterization of optical resonances, including absorption, emission polarization, and radiative lifetimes.
Main Results:
- Demonstrated the formation of atomic-sized patches of the 1T phase within a 1H matrix.
- Observed unique electronic bands arising from these polymorphic structures.
- Confirmed the emergence of robust optical resonances with strong absorption and circularly polarized emission.
- Measured significantly long radiative lifetimes for the generated optical resonances.
Conclusions:
- Atomic manipulation of 2D semiconductors enables the creation of additional optical resonances beyond intrinsic excitons.
- Polymorphic structures offer a pathway to engineer novel optoelectronic properties in 2D materials.
- This approach opens new avenues for developing efficient light-harvesting devices and advanced exciton-based photonics.
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