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 (|∆n/∆k|) is ~125, which is significantly higher than the |∆n/∆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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The experimental dataset and its analysis is provided in the paper and any additional datasets that support the plots within this paper and other findings of this study are available from the corresponding author upon reasonable request.
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Research on tunable optical phenomena in TMD semiconductors was supported as part of the Energy Frontier Research Center on Programmable Quantum Materials funded by the US Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), under award no. DE-SC0019443. Research by I.D. on TMD films for ultrafast and low-power applications was funded by the Defense Advanced Research Projects Agency (DARPA) award nos. HR001110720034 and FA8650-16-7643 and the Air Force Office of Scientific Research (AFOSR) MURI award no. FA9550-18-1-0379. Integration of TMDs with Si photonics for data communications was funded by the Office of Naval Research (ONR) award no. N00014-16-1-2219 and National Aeronautics and Space Administration (NASA) grant no. NNX16AD16G. C.P. and J.P. acknowledge funding from AFOSR (FA9550-16-1-0031 and FA9550-16-1-0347). Y.Y. and L.C. acknowledge support from an EFRI award from NSF (EFMA 1741693). S.H.C. was supported by the Postdoctoral Research Program of Sungkyunkwan University (2016). This work was done in part at the City University of New York Advanced Science Research Center NanoFabrication Facility, in part at the Cornell Nanoscale Facility, supported by NSF award no. EECS-1542081 and in part at the Columbia Nano Initiative (CNI) shared labs at Columbia University in the City of New York. We thank A. Mohanty, C.T. Phare, S.A. Miller and U.D. Dave for fruitful discussions.
M.L., J.H., I.D., S.C., G.R.B. and D.N.B are named inventors on US provisional patent application 16/282,013 regarding the technology reported in this article.
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Datta, I., Chae, S.H., Bhatt, G.R. et al. Low-loss composite photonic platform based on 2D semiconductor monolayers. Nat. Photonics 14, 256–262 (2020). https://doi.org/10.1038/s41566-020-0590-4
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