Ultrathin broadband antireflection structure composed of multilayer hollow nanopillar arrays of c-Si and Ag shells embedded in a GaAs substrate

作者：Ahmadivand Arash^*; Golmohammadi Saeed

来源：Optik, 2016, 127(2): 815-818.

DOI：10.1016/j.ijleo.2015.08.129

• Multilayer hollow nanopillars
• C-Si and Ag shells
• Antireflective structure
• Reflectance

In this study, we investigated the spectral response and properties of compositional multilayer hollow nanopillars in the certain arrays that are embedded in a GaAs substrate to design a broadband antireflection subwavelength structure. Considering the arrays of multilayer hollow nanopillars (crystalline-Si/Agiair) with the appropriate geometrical sizes, three kinds of optical modes at the absorption profile in the wide range of the spectrum are reported. Fabry-Perot (FP), hybrid, and plasmon resonance modes are the three appeared optical modes at the calculated absorption cross-sectional profile using numerical method. Quantifying the reflectance of the subwavelength structure, this parameter is measured as approximately 6.69% in the range of lambda similar to 400-2900 nm. We proved that proposed nano structure is able to provide high ratio of optical energy absorption due to the existence of GaAs, c-Si and Ag substances that play fundamental role in this enhancement as the absorber materials.

• 出版日期2016