title: Strong infrared absorber: surface-microstructured Au film replicated from black silicon.
abstract: With quasi-periodic microstructures, great enhancement of infrared light absorption of Au film over a broad wavelength band (2.7~15.1 μm) was realized experimentally for the first time. The microstructured Au film was prepared by replica molding of the surface of femtosecond (fs) laser microstructured silicon (black silicon). This unique absorption characteristic is mainly ascribed to good impedance match from free space to Au film. The surface of the sample was examined by X-ray photoelectron spectroscopy (XPS) and the four peaks of absorptance were ascribed to residual polydimethylsiloxane (PDMS), H2SO4, adsorbed water and CO2 in the air, respectively.
authors: State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China.
authors: Saifeng
authors: S
authors: Zhang
authors: Yuan
authors: Y
authors: Li
authors: Guojin
authors: G
authors: Feng
authors: Baocheng
authors: B
authors: Zhu
authors: Shiyi
authors: S
authors: Xiao
authors: Lei
authors: L
authors: Zhou
authors: Li
authors: L
authors: Zhao