Antimony (Sb) is a novel elementary material that has recently garnered extensive attention owing to its intriguing physical properties, such as topological, thermoelectric, and photoelectric properties. Further studies regarding Sb crystal structures will enable a better understanding of their properties and facilitate their application. In this study, Sb nanosheets in the form of triangular islands with tunable thicknesses are grown on the mica substrate through chemical vapor deposition. Characterization is performed via scanning electron microscopy, transition electron microscopy, and atomic force microscopy; it is shown that the largest crystallite size exceeds 30 μm. Nonlinear transmission measurements reveal that Sb nanosheets under excitation with a 1030 nm laser possess the maximum nonsaturation two-photon absorption (TPA) coefficient of 8.49 × 10³ cm/GW, which indicated that Sb possesses great nonlinear optical properties and may be applied in advanced photonic and optoelectronic devices.

中文翻译：

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具有范德华外延的单晶 Sb 纳米片中的非线性光学响应和超快载流子动力学

锑 (Sb) 是一种新型的基本材料，由于其有趣的物理性质，如拓扑、热电和光电性质，最近引起了广泛关注。关于 Sb 晶体结构的进一步研究将有助于更好地了解其性质并促进其应用。在这项研究中，通过化学气相沉积在云母衬底上生长了具有可调厚度的三角形岛形式的 Sb 纳米片。通过扫描电子显微镜、跃迁电子显微镜和原子力显微镜进行表征；结果表明，最大微晶尺寸超过 30 μm。³ cm/GW，这表明 Sb 具有很好的非线性光学特性，可以应用于先进的光子和光电器件。