Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/117842
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Type: Journal article
Title: Stacked nanoporous anodic alumina gradient-index filters with tunable multispectral photonic stopbands as sensing platforms
Author: Acosta, L.
Bertó-Roselló, F.
Xifre-Perez, E.
Santos, A.
Ferré-Borrull, J.
Marsal, L.
Citation: ACS Applied Materials and Interfaces, 2019; 11(3):3360-3371
Publisher: ACS Publications
Issue Date: 2019
ISSN: 1944-8244
1944-8252
Statement of
Responsibility: 
Laura K. Acosta, Francesc Bertó-Roselló, Elisabet Xifre-Perez, Abel Santos, Josep Ferré-Borrull, and Lluis F. Marsal
Abstract: This study presents the development and optical engineering of stacked nanoporous anodic alumina gradient-index (NAA-GIFs) filters with tunable multispectral photonic stopbands for sensing applications. The structure of these photonic crystals (PC) is formed by stacked layers of NAA produced with sinusoidally modified effective medium. The progressive modification of the sinusoidal period during the anodization process enables the generation and precise tuning of the characteristic photonic stopbands (PSB) (i.e., one per sinusoidal period in the anodization profile) of these PC structures. Four types of NAA-GIFs featuring three distinctive PSBs positioned within the visible spectral region are developed. The sensitivity of the effective medium of these NAA-GIFs is systematically assessed by measuring spectral shifts in the characteristic PSBs upon infiltration of their nanoporous structure with analytical solutions of d-glucose with several concentrations (0.025–1 M). This study provides new insights into the intrinsic relationship between the nanoporous architecture of these PCs and their optical properties, generating opportunities to fabricate advanced optical sensing systems for high-throughput and multiplexed detection of analytes in a single sensing platform.
Keywords: Nanoporous anodic alumina; photonic crystals; stacked; gradient index filters; multispectral bands; sensing platforms
Rights: © 2018 American Chemical Society
RMID: 0030107788
DOI: 10.1021/acsami.8b19411
Grant ID: http://purl.org/au-research/grants/arc/CE140100003
Appears in Collections:Chemical Engineering publications

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