Open AccessFabrication of antireflective hierarchical TiO2 nanostructures by moth-eye patterning of anodic anodized nanotubes
Author(s) -
Yunha Ryu,
Kyoungsik Kim
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.031490
Subject(s) - materials science , fabrication , anodizing , nanostructure , nanotechnology , refractive index , surface plasmon resonance , plasmon , optoelectronics , anti reflective coating , etching (microfabrication) , nanotube , lithography , optics , layer (electronics) , nanoparticle , carbon nanotube , composite material , physics , pathology , medicine , aluminium , alternative medicine
Herein, we report the fabrication and characterization of a hierarchical TiO 2 structure that exhibits reduced surface reflection. The hierarchical structure, which is a moth-eye-shaped array containing nanotubes, was fabricated by dry-etching a TiO 2 nanotube layer, by using colloidal lithography. The fabricated structure shows a reduced reflectance, compared with that of non-patterned TiO 2 nanotubes. This is because of the graded refractive index of the moth-eye pattern. Furthermore, we investigated the optical properties of gold-decorated moth-eye TiO 2 nanotubes and found that the absorption, which was caused by the plasmonic resonance of gold nanostructures, was further enhanced by coupling with the light-trapping effect.