Journal
NATURE PHOTONICS
Volume 14, Issue 4, Pages 256-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41566-020-0590-4
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Funding
- Energy Frontier Research Center on Programmable Quantum Materials - US Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-SC0019443]
- Defense Advanced Research Projects Agency (DARPA) [HR001110720034, FA8650-16-7643]
- Air Force Office of Scientific Research (AFOSR) MURI [FA9550-18-1-0379]
- Office of Naval Research (ONR) [N00014-16-1-2219]
- National Aeronautics and Space Administration (NASA) [NNX16AD16G]
- AFOSR [FA9550-16-1-0031, FA9550-16-1-0347]
- EFRI award from NSF [EFMA 1741693]
- Sungkyunkwan University
- NSF [EECS-1542081]
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The optical properties of transition metal dichalcogenides (TMDs) are known to change dramatically with doping near their excitonic resonances. However, little is known about the effect of doping on the optical properties of TMDs at wavelengths far from these resonances, where the material is transparent and therefore could be leveraged in photonic circuits. We demonstrate the strong electrorefractive response of monolayer tungsten disulfide (WS2) at near-infrared wavelengths (deep in the transparency regime) by integrating it on silicon nitride photonic structures to enhance the light-matter interaction with the monolayer. We show that the doping-induced phase change relative to the change in absorption (| increment n/increment k|) is 125, which is significantly higher than the | increment n/increment k| observed in materials commonly employed for silicon photonic modulators, including Si and III-V on Si, while accompanied by negligible insertion loss.
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