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Tunable Valley Polarized Plasmon-Exciton Polaritons in Two-Dimensional Semiconductors
Boyang Ding1, Zhepeng Zhang2, Yu-Hui Chen3
1MacDiarmid Institute for Advanced Materials and Nanotechnology, Dodd-Walls Centre for Photonic and Quantum Technologies, Department of Physics , University of Otago , Dunedin 9016 , New Zealand.
ACS Nano
|February 7, 2019
Summary
Researchers created plasmonic crystals with tungsten disulfide monolayers to control light-matter interactions. This enables tunable valley-polarized light emission for nanoscale optical information processing at room temperature.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Transition-metal dichalcogenide monolayers exhibit unique electronic valleys.
- Valley-addressable excitons can be controlled with polarized light.
- Strong coupling leads to polaritons, quasiparticles of light and matter.
Purpose of the Study:
- To create a platform for controlling valley-polarized light emission.
- To investigate strong coupling between excitons and plasmonic crystals.
- To demonstrate nanoscale optical information processing.
Main Methods:
- Fabrication of self-assembled plasmonic crystals.
- Integration of tungsten disulfide monolayers onto plasmonic crystals.
- Characterization using transmission spectra and photoluminescence measurements.
- Angle-dependent optical measurements.
Main Results:
- Achieved strong coupling with a Rabi splitting of ~160 meV.
- Observed room-temperature valley-polarized photoluminescence.
- Demonstrated tunable valley polarization by altering excitation/emission angles.
Conclusions:
- Self-assembled plasmonic crystals provide a versatile platform for manipulating valleytronics.
- This work enables the detection, control, and processing of optical spin and valley information.
- The developed system operates under ambient conditions for practical applications.
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