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Evanescent-Field-Guiding 2D Ultrathin Waveguides for Seamlessly Integrated Devices
Samuel Kim1, Chengyun Hong2, Youngjun Chung1
1Department of Materials Science and Engineering, Seoul National University, Seoul 08826, South Korea.
Nano Letters
|September 10, 2025
Summary
This study introduces 2D ultrathin waveguides for seamless integration of active devices in photonic circuits. These waveguides utilize evanescent fields for efficient light interaction, enabling highly sensitive photodetectors.
Area of Science:
- Materials Science
- Photonics
- Nanotechnology
Background:
- Conventional waveguides limit active device integration due to tight light confinement.
- Evanescent fields offer potential for enhanced light-matter interaction.
Purpose of the Study:
- To propose and demonstrate a 2D ultrathin waveguide platform for efficient integration of active photonic devices.
- To leverage evanescent fields for improved light accessibility in photonic integrated circuits.
Main Methods:
- Utilized a monolayer MoS2 film as a 2D ultrathin waveguide.
- Integrated a WSe2 photodetector onto the MoS2 waveguide.
- Characterized optical mode properties and photodetector performance.
Main Results:
- Guided light in MoS2 waveguides exhibited >99.9% energy in the evanescent field over millimeter distances.
- The integrated WSe2 photodetector achieved nanowatt sensitivity and microsecond response times.
- Demonstrated high polarization selectivity (0.94) for the integrated photodetector.
Conclusions:
- 2D ultrathin waveguides are a viable platform for compact and robust photonic integrated circuits.
- Evanescent-field guiding facilitates seamless integration of active and passive photonic components.
- This approach enables next-generation optoelectronic devices with enhanced performance.
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