Herein, a 20‐fold enhancement of the optical second harmonic generation (SHG) from WS₂ monolayers by cooperating with SiO₂ dielectric microspheres (MSs) is reported. Detailed experiment and simulation studies indicate that the SHG enhancement is dominantly originated by the enhanced excitation intensity and enlarged collection efficiency produced by the SiO₂ MSs. The size effect of the SiO₂ MS on the SHG enhancement is also systematically investigated. Moreover, the SHG enhancement is found to be very sensitive to the surrounding refractive index of the SiO₂ MS, which advocates great promise for the photonic sensing applications. This work provides a low‐cost and efficient approach to enhancing the SHG emission, and demonstrates great potential for functional nanodevices based on hybrid dielectric structures.

中文翻译：

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通过与介电微球合作增强WS2单层的第二谐波产生

本文报道了通过与SiO ₂介电微球（MSs）协同作用，WS ₂单分子层产生的光学二次谐波（SHG）增强了20倍。详细的实验和模拟研究表明，SHG的增强主要是由SiO ₂ MS产生的增强的激发强度和更大的收集效率引起的。还系统地研究了SiO ₂ MS对SHG增强的尺寸效应。此外，发现SHG的增强对SiO ₂的周围折射率非常敏感。MS，它为光子传感应用鼓舞了广阔的前景。这项工作提供了一种低成本，有效的方法来增强SHG的发射，并展示了基于混合介电结构的功能纳米器件的巨大潜力。