Analysis of anti-reflection mechanisms of the black aluminum alloy made by femtosecond laser processing

Abstract Mitigating the optical reflection of aluminum alloy over a broad spectral range from 0.45 μ m to 15 μ m is vital for many applications. This can be realized by introducing efficient light-absorbing textured surfaces via femtosecond laser surface processing. However, a clear analysis of antireflection performance has not been reported yet. This paper proposes a numerical model of anti-reflective structures is proposed based on SEM and EDS characterization. Multiple anti-reflective mechanisms were revealed intuitively through FDTD simulation.