Metal-coated moth-eye films display broadband light-absorption (BLA) over the visible (380–780 nm) and near-infrared (780–1000 nm) spectral ranges when illuminated from the rear. The pillars on the moth-eye film function as a template of cone-shaped metallic cavities. The average absorptance is 91% over the visible wavelength range. Calculations based on the finite-difference time-domain method revealed that the high absorptance is due to effective capturing of illuminating light in the cone-shaped metallic cavities. This BLA metamaterial, with dimensions larger than 1 cm 2 and fabricated without using any nanofabrication technique, is useful for photonics applications involving, e.g. light-harvesting and light-emission.

中文翻译：

---

锥形金属腔的可见光和近红外宽带光吸收器

从背面照射时，涂有金属膜的蛾眼膜在可见光（380–780 nm）和近红外（780–1000 nm）光谱范围内显示宽带光吸收（BLA）。蛾眼膜上的柱子用作锥形金属腔的模板。在可见光波长范围内，平均吸收率为91％。基于时域有限差分法的计算表明，高吸收率是由于有效捕获锥形金属腔中的照明光所致。这种BLA超材料的尺寸大于1 cm 2且无需使用任何纳米制造技术即可制造，可用于涉及光收集和发光的光子学应用。