LAUSR

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 is 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, net resonant emission from a monolayer semiconductor is demonstrated under simulated solar illumination by a white‐light‐emitting diode. The device is formed by embedding a 2D 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 well‐consistent resonant wavelength, linewidth, polarization, location, and Gaussian‐beam profile. The fundamental TEM00 mode behaves as a doublet emission, resulting from anisotropy‐induced non‐degenerate states with orthogonal polarizations. The extraordinary spectral flipping is attributed to the competitive interplay of resonant absorption and emission. This work paves a way toward white‐light or solar‐powered state‐of‐the‐art photonic applications at the chip scale.