Distributed Bragg reflector made of anodic alumina membrane

A new kind of distributed Bragg reflector is made of layer-by-layer anodic alumina membrane using electrochemical anodization, which is consisted of periodically stacked main stem channel layers and branched channel layers with the period comparable to the optical wavelength. The first Bragg condition peak, which is characterized for main inhibition of incident light perpendicular to the surface of anodic alumina membrane, could be modulated from 727 to 1200 nm by modifying the anodizing voltage waveform. It possibly provides a plan to fabricate light filters in large area, which have very low transmissivity within stop band but high transmissivity in other ranges. (C) 2008 Elsevier B.V. All rights reserved.