Abstract
Femtosecond laser induced periodic surface structures (LIPSSs) are excellent biomimetic iridescent antireflective interfaces.In this work,we demonstrate the feasibility to develop tunable iridescent antire-flective surfaces via simultaneous synthesis of functional metal-oxide nanomaterials,in situ deposition and hierarchical LIPSSs nanostructuring by means of femtosecond laser ablation (fs-LA) of tungsten (W)and molybdenum (Mo) in air.Adjusting the scanning interval from 1 μm to 20 μm allows the mod-ulation of particle deposition rates on LIPSSs.Diminishing the scan interval enables a higher particle deposition rate,which facilitates the development of better UV-to-MIR ultrabroadband antireflective surfaces with a less pronounced iridescence.Through comparing the reflectance of hierarchical LIPSSs with different densities of loosely/tightly deposited particles,it is found that the deposited WOx and MoOx particle aggregates have high UV-to-MIR ultrabroadband absorbance,especially extraordinary in the MIR range.Loosely deposited particles which self-assembly into macroporous structures outper-form tightly deposited particles for ultrabroadband antireflective applications.The presence of loosely deposited MoOx and WOx particle absorbers can cause up to 80 ％ and 60 ％ enhancement of antire-flectance performances as compared to the tightly particle deposited LIPSSs samples.One stone of"fs-LA technique" with three birds of (particle generation,in situ deposition and LIPSS hierarchical nanostruc-turing) presented in this work opens up new opportunities to tune the reflectance and iridescence of metallic surfaces.
NETL
NSTL
维普
万方数据