Broadband optical antireflection enhancement by integrating antireflective nanoislands with silicon nanoconical-frustum arrays

Abstract

Based on conventional colloidal nanosphere lithography, we experimentally demonstrate novel graded-index nanostructures for broadband optical antireflection enhancement including the near-ultraviolet (NUV) region by integrating residual polystyrene antireflective (AR) nanoislands coating arrays with silicon nano-conical-frustum arrays. This is a feasible optimized integration method of two major approaches for antireflective surfaces: quarter-wavelength AR coating and biomimetic moth's eye structure. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.