In situ constructing program-designed nanostructures via laser-direct-writing (LDW) has proved to be a reliable strategy for optical storage (OS). Herein, a kind of low-melting Ag⁺-doped TeO₂–ZnO–Na₂O (TZN) tellurite glass has been demonstrated as an ideal LDW OS medium. Microstructural and spectroscopic studies reveal the generation of molecule-like Ag_m^x+ nanoclusters featured with a broad emission band in the orange-red region upon laser irradiation. Probing the laser-glass interaction yields evidences of the spatial distribution of Ag species responsive to laser-induced thermoelastic pressure wave oscillation, as well as the heat-driven migration/aggregation of Ag species along the radial direction of the laser spot. Raman analyses disclose the loose network of TZN-glass convenient for Ag⁺ mobility and the increased network connectivity when Ag_m^x+ nanoclusters are precipitated out. Combined with the XPS result of Ag⁺ → Ag⁰ reduction, the possible formation mechanism of Ag nanoclusters stabilized in glass has been proposed. In a proof-of-concept experiment, 3D volumetric OS in the TZN glass has been demonstrated, showing optical data encoding/decoding in the form of characters and image patterns.

中文翻译：

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用于 3D 体积光存储的透明碲酸盐玻璃中类分子 Agmx+ 纳米团簇的激光直写

通过激光直写 (LDW)原位构建程序设计的纳米结构已被证明是一种可靠的光学存储 (OS) 策略。在此，一种低熔点 Ag ⁺掺杂的 TeO ₂ –ZnO–Na ₂ O (TZN) 碲酸盐玻璃已被证明是一种理想的 LDW OS 介质。显微结构和光谱研究揭示了分子状 Ag _m ^{x + 的产生}纳米团簇在激光照射下在橙红色区域具有宽发射带。探测激光-玻璃相互作用产生了响应激光诱导的热弹性压力波振荡的 Ag 物质空间分布的证据，以及 Ag 物质沿激光光斑径向的热驱动迁移/聚集。拉曼分析揭示了 TZN 玻璃的松散网络有利于 Ag ⁺迁移，以及当 Ag _m ^{x +}纳米团簇沉淀出来时网络连接性增加。结合 Ag ⁺ → Ag ⁰的 XPS 结果还原，提出了稳定在玻璃中的银纳米团簇的可能形成机制。在概念验证实验中，TZN 玻璃中的 3D 体积 OS 已被展示，以字符和图像图案的形式显示光学数据编码/解码。