Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/124849
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Type: Journal article
Title: Realization of high-quality optical nanoporous gradient-index filters by optimal combination of anodization conditions
Author: Law, C.S.
Lim, S.Y.
Liu, L.
Abell, A.D.
Marsal, L.F.
Santos, A.
Citation: Nanoscale, 2020; 12(17):9404-9415
Publisher: ROYAL SOC CHEMISTRY
Issue Date: 2020
ISSN: 2040-3364
2040-3372
Statement of
Responsibility: 
Cheryl Suwen Law, Siew Yee Lim, Lina Liu, Andrew D. Abell, Lluis F. Marsal, and Abel Santos
Abstract: High-quality nanoporous anodic alumina gradient-index filters (NAA-GIFs) are realized by sinusoidal pulse anodisation (SPA) of aluminum. A three-level factorial design of experiments is used to determine the effect of three critical anodization parameters -electrolyte temperature, concentration of the electrolyte and anodization time- on the quality of light control in these photonic crystal (PC) structures. Quantitative analysis of the effect of these anodization parameters on the quality of the characteristic photonic stopband (PSB) of NAA-GIFs reveals that all three anodization parameters and their respective combinations have statistically significant effects. However, anodization time is found to have the highest impact on the quality of light control in NAA-GIFs, followed by the electrolyte concentration and its temperature. Our findings demonstrate that NAA-GIFs fabricated under optimal conditions achieve an outstanding quality factor of ∼86 (i.e. ∼18% superior to that of other NAA-based PCs reported in the literature). This study provides new insight into optimal anodization conditions to fabricate high-quality NAA-based PC structures, opening new exciting opportunities to integrate these nanoporous PCs as platform materials for light-based technologies requiring a precise control over photons such as ultra-sensitive optical sensors and biosensors, photocatalysts for green energy generation and environmental remediation, optical encoding and lasing.
Rights: This journal is © The Royal Society of Chemistry 2020
RMID: 1000016906
DOI: 10.1039/c9nr10526c
Grant ID: http://purl.org/au-research/grants/arc/CE140100003
Appears in Collections:Chemical Engineering publications

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