A copper film with the well arrays structure is prepared by magnetron sputtering in an anodic aluminum oxide (AAO) template. The ultraviolet–visible absorption spectra indicate that the light absorbance of the film is as high as 99.6% in the wavelength range of 200–2500 nm. The copper nanowell-array film exhibits a strong absorptance at the spectral range of 200–2500 nm owing to light trapped in the nanowell-array structures, the interband transition of copper, and the surface plasmon resonances of copper nanowell-arrays. This near-perfect broadband light absorption from UV–vis–NIR might improve greatly the utilization of light.

中文翻译：

---

有序的铜纳米孔阵列膜，具有从紫外线到近红外光的近乎完美的宽带吸收

通过在阳极氧化铝（AAO）模板中进行磁控溅射制备具有阱阵列结构的铜膜。紫外可见吸收光谱表明，该膜在200–2500 nm波长范围内的吸光率高达99.6％。由于捕获在纳米孔阵列结构中的光，铜的带间跃迁以及铜纳米孔阵列的表面等离子体激元共振，铜纳米孔阵列膜在200–2500 nm的光谱范围内显示出很强的吸收率。UV-vis-NIR吸收的近乎完美的宽带光可能会大大提高光的利用率。