Abstract
A high-efficiency nonlinear source of visible light in a multiple-quantum-well (MQW) metasurface is in high demand for photonic quantum technology, but existing systems suffer from the limited conduction-band offset of MQWs and high dissipative losses of metal, which severely limit applicability in the visible range. This study presents a simple, reliable system without metal losses, by utilizing the interband excitonic transitions of MQWs and the Mie resonances of the metasurface's structure. This shows a viable path toward a coherent, nonlinear light source for use in the visible region and beyond with high conversion efficiency, to enable nanophotonic quantum information processing.
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