White-light driven resonant emission from a monolayer semiconductor

Resonant emission in photonic structures is very useful to construct all-photonic circuits for optical interconnects and quantum computing. Optical generation of most resonant emitting modes in photonic structures has been obtained by coherent pumping rather than incoherent illumination. Particularly, the development of white-light or even solar-powered on-chip light sources remains challenging but is very attractive in view of the much facile availability of these incoherent excitation sources. Here the net resonant emission from monolayer semiconductor has been demonstrated under the simulated solar illumination by a white light-emitting diode. The device is formed by embedding a two-dimensional gain medium into a planar microcavity on a silicon wafer, which is compatible with the prevailing on-chip photonic technology. Coherent and white-light excitation sources are respectively selected for optical pumping, where the output light in two cases exhibits the well-consistent resonant wavelength, linewidth, polarization, location, and Gaussian-beam profile. The fundamental TEM00 mode behaves a doublet emission, resulting from anisotropy-induced nondegenerate states with orthogonal polarizations. The extraordinary spectral flipping is attributed to the competitive interplay of resonant absorption and emission. This work paves a way towards white-light or solar-powered state-of-the-art photonic applications at the chip scale. This article is protected by copyright. All rights reserved.Ministry of Education (MOE)National Research Foundation (NRF)Submitted/Accepted versionT.Y. acknowledges the support by the Ministry of Education of Singapore (MOE 2019-T2-1-044) and the Singapore National Research Foundation (NRF) under the Competitive Research Programs (NRF-CRP-21-2018-0007). J. S. appreciates the support of the Fundamental Research Funds for the Central Universities of China, National Natural Science Foundation of China under Grant No. 61904151, Natural Science Foundation of Shaanxi under Grant No. 2020 JM-108 and the Joint Research Funds of Department of Science & Technology of Shaanxi Province and Northwestern Polytechnical University (2020GXLH-Z-020). C.X. thanks the support of the National Natural Science Foundation of China (61774040), the National Key R&D Program of China (2018YFA0703700), the Shanghai Municipal Science and Technology Commission (18JC1410300), the Fudan University-CIOMP Joint Fund (Grant No. FC2018-002), the National Young 1000 Talent Plan of China, and the Shanghai Municipal Natural Science Foundation (20ZR140320016ZR1402500).W.H. thanks the support of the Ministry of Education of China (IRT1148), Synergetic Innovation Center for Organic Electronics and Information Displays (61136003), National Natural Science Foundation of China (51173081), and Fundamental Studies of Perovskite Solar Cells (2015CB932200).S. F. is supported by H2020-MSCA-IF-2020 SingExTr (No. 101031596)