AI 中文总结
研究探索三元过渡金属二硫属化物介电函数温度依赖性，通过对MoSSe和WSSe在特定光谱区域与温度窗口研究，揭示介电响应规律，利用其光学色散设计近红外光子透镜，为热驱动光电器件创建提供关键见解。
AI 中文摘要
过渡金属二硫属化物（TMDs）及其三元衍生物因在可见和近红外光谱区域出现明显的激子共振而备受关注，能实现强光与物质相互作用。然而，该家族大多数代表的温度相关光学色散仍未得到全面了解。本文报告了对单轴三元MoSSe和WSSe在430 - 1000 nm光谱区域、80 - 670 K宽温度窗口下介电常数函数的系统研究。结果表明，其介电响应的温度演变在可见光谱区域受Varshni形式主义支配，进而影响其在无损近红外光谱尾部的高折射率特性。此外，利用测量的三元WSSe光学色散设计了超薄平凸近红外光子透镜，其性能随温度变化而连续调制。我们的工作为下一代热驱动纳米光子和光电器件的创建提供了关键见解。
英文摘要
Transition metal dichalcogenides (TMDs), along with their ternary derivatives, have attracted considerable attention mostly due to pronounced excitonic resonances emerging in visible (Vis) and near-infrared (NIR) spectral regions, enabling strong light-matter interaction. Nevertheless, a comprehensive insight of the temperature-dependent optical dispersions for the most of representatives of the family remains yet unrevealed. Here, we report on systematic studies of dielectric permittivity functions of uniaxial ternary MoSSe and WSSe across 430-1000 nm spectral region over a broad temperature window of 80-670 K. We show that the temperature evolution of their dielectric responses is governed by Varshni's formalism in Vis spectral region further affecting their high refractive index properties at the lossless NIR spectral tails. Furthermore, we exploit the measured optical dispersion of ternary WSSe designing ultrathin plano-convex NIR photonic lenses that demonstrate continuous modulation of performance with temperature variation. Our work provides critical insights for the creation of next-generation thermo-driven nanophotonic and optoelectronic devices.
