Unconventional electroabsorption in monolayer MoS2
| Autor: | Guglielmo Lanzani, Dmitry Ovchinnikov, Andras Kis, Daniele Vella, Victor Vega-Mayoral, Yen-Cheng Kung, Dragan Mihailovic, Dumitru Dumcenco, Nicola Martino, Christoph Gadermaier, Maria Rosa Antognazza |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Exciton Physics::Optics Field strength 02 engineering and technology Electromodulation 01 natural sciences Transition metal dichalcogenides Monolayer MoS2 Laser linewidth symbols.namesake 0103 physical sciences General Materials Science Electroabsorption Excitons Spectroscopy Trions Chemistry (all) Materials Science (all) Condensed Matter Physics Mechanics of Materials Mechanical Engineering 010306 general physics Optical properties business.industry General Chemistry 021001 nanoscience & nanotechnology Stark effect Modulation symbols Optoelectronics Photonics Trion MoS2 0210 nano-technology business Refractive index |
| Zdroj: | 2D Materials |
| Popis: | Signal modulation in optoelectronics is obtained by modulation of either the refractive index or the absorbance by an electric field. However, electromodulators have not kept up with the miniaturization of other electronic and optical components. Here we show a strong transverse electroabsorption signal in a monolayer of the 2D semiconductor MoS2. The electroabsorption spectrum is dominated by an apparent linewidth broadening of around 15% at a modulated voltage of only V-pp = 0.5 V. Contrary to known variants of the Stark effect, the broadening increases linearly with the applied field strength and arises from a linear variation of the distance between the strongly overlapping exciton and trion resonances. The achievable modulation depths exceeding 0.1 dB nm(-1) bear the scope for extremely compact, ultrafast, energy-efficient electroabsorption modulators for integrated photonics, including on-chip optical communication. |
| Databáze: | OpenAIRE |
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