Localization-of-light-induced Stimulated Mie Scattering: Laser Pulse Duration Adjustment in a Broad Range

Backward stimulated Mie scattering (BSMS) holds significant potential across various fields due to its superior properties. In this study, we demonstrate that metal-semiconductor hybrids of CdS shell and Au core markedly enhanced the BSMS compared with pure CdS nanoparticles. Theoretical analysis suggests that the enhancement should be attributed to multi-photon excitation and increased Anderson localization of light. The localized light interacts with the incident light, creating conditions conducive to BSMS, thereby improving efficiency and reducing the threshold. The enhanced localization of light is a result of the increased nonlinear refractive index induced by electron-sink effect. Importantly, we propose a novel strategy, on the basis of BSMS, to adjust the pulse duration of laser output in a broad range without any frequency shift.