Stray Light in 3D Porous Nanostructures of Single-Crystalline Copper Film

IF 11.1 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Small Science Pub Date : 2024-08-02 DOI:10.1002/smsc.202400174
Yu-Seong Seo, Teawoo Ha, Ji Hee Yoo, Su Jae Kim, Yousil Lee, Seungje Kim, Young-Hoon Kim, SeungNam Cha, Young-Min Kim, Se-Young Jeong, Jungseek Hwang
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Abstract

In the design of optical devices and components, geometric structures and optical properties of materials, such as absorption, refraction, reflection, diffraction, scattering, and trapping, have been utilized. Finding the ideal material with certain optical and geometric characteristics is essential for a customized application. Herein, unoxidizable achromatic copper films (ACFs) are fabricated on Al2O3 substrates utilizing an atomic sputtering epitaxy apparatus. ACFs are made up of two regions vertically: a comparatively flat layer region and a 3D porous nanostructured region on top of the flat region. The measured specular reflectance displays low-pass filter behavior with a sharp cutoff frequency in the infrared spectrum. Furthermore, the measured diffusive reflectance spectra show light-trapping behavior in the spectral region above the cutoff frequency, where there are no known absorption mechanisms, such as phonons and interband transitions. A focused ion beam scanning electron microscope is utilized to study the thin film's nanostructured region through 3D tomographic analysis in order to comprehend the phenomena that are observed. This work will shed fresh light on the design and optimization of optical filters and light-trapping employing porous nanostructured metallic thin films.

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单晶铜膜三维多孔纳米结构中的杂散光
在光学设备和元件的设计中,材料的几何结构和光学特性,如吸收、折射、反射、衍射、散射和捕获等,都被加以利用。找到具有特定光学和几何特性的理想材料对于定制应用至关重要。本文利用原子溅射外延设备,在 Al2O3 基底上制作了不可氧化的消色差铜膜 (ACF)。消色差铜膜在垂直方向上由两个区域组成:一个相对平坦的层区域和位于平坦区域之上的三维多孔纳米结构区域。测得的镜面反射率显示出低通滤波器的特性,在红外光谱中具有尖锐的截止频率。此外,所测得的漫反射光谱在截止频率以上的光谱区域显示出光捕获行为,在该区域不存在已知的吸收机制,如声子和带间跃迁。我们利用聚焦离子束扫描电子显微镜,通过三维层析分析研究薄膜的纳米结构区域,以理解所观察到的现象。这项工作将为利用多孔纳米结构金属薄膜设计和优化光学过滤器和光捕获提供新的启示。
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来源期刊
CiteScore
14.00
自引率
2.40%
发文量
0
期刊介绍: Small Science is a premium multidisciplinary open access journal dedicated to publishing impactful research from all areas of nanoscience and nanotechnology. It features interdisciplinary original research and focused review articles on relevant topics. The journal covers design, characterization, mechanism, technology, and application of micro-/nanoscale structures and systems in various fields including physics, chemistry, materials science, engineering, environmental science, life science, biology, and medicine. It welcomes innovative interdisciplinary research and its readership includes professionals from academia and industry in fields such as chemistry, physics, materials science, biology, engineering, and environmental and analytical science. Small Science is indexed and abstracted in CAS, DOAJ, Clarivate Analytics, ProQuest Central, Publicly Available Content Database, Science Database, SCOPUS, and Web of Science.
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