The compositional and optical properties of an aluminum‐based transition‐metal alloy system (Au–Ag–Al) as an advanced material for photonic applications are investigated. The system is fabricated by sequentially evaporating thin layers of gold, silver, and aluminum. The thickness of Al is varied to reflect different percentages in the alloyed films. Alloying of the metals is confirmed from the shifts in the electronic binding energy of the pure elements through X‐ray photoelectron spectroscopy. The current–voltage measurements demonstrate good ohmic conductivity in the films and the optical properties are obtained by standard absorption and z‐scan techniques. Plasmonic peaks are observed in the alloyed system related to the participating metals. The thermal nonlinear optical response is conducted in the continuous wave (CW) regime. The films show large values for the thermo‐optical coefficient ( $\partial n/\partial T)$ which results in high values (≈10⁻³ cm² W⁻¹) for the third‐order nonlinear coefficient ( $n_2^{them}$). A discussion of these values and their impact on the application of thin alloyed metals is presented.

中文翻译：

---

Au-Ag-Al纳米合金薄膜作为光子应用的先进材料：XPS分析，CW体制下的线性和非线性光学性质

研究了铝基过渡金属合金系统（Au–Ag–Al）作为光子应用的高级材料的成分和光学性质。通过依次蒸发金，银和铝的薄层来制造该系统。Al的厚度变化以反映合金膜中的不同百分比。通过X射线光电子能谱分析纯元素的电子结合能的变化可以证实金属的合金化。电流-电压测量结果表明薄膜中具有良好的欧姆电导率，并且光学特性是通过标准吸收和z扫描技术获得的。在与参与金属有关的合金体系中观察到了等离子峰。热非线性光学响应以连续波（CW）方式进行。$\partial ñ/\partial Ť）$这导致高的值（≈10 ^-3厘米² w ^ ^-1）为三阶非线性系数（${ñ}_2^{ŤHË米}$）。讨论了这些值及其对薄合金金属应用的影响。