Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 18, Pages 9879-9888Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b01885
Keywords
electrochemical anodization; anodic aluminum oxide; nanopores; photonic crystal; distributed Bragg reflectors; microcavities; chemical sensing
Funding
- Australian Research Council (ARC) [DE14010054, FT110100711]
- National Health and Medical Research Council (NHMRC) of Australia [APP627015]
- Australian Breast Cancer Research (ABCR)
- University of Adelaide Interdisciplinary Research Fund [DVC IRF-2014]
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Structural engineering of porous, anodic aluminum oxide (AAO) nanostructures by anodization has been extensively studied in the past two decades. However, the transition of this technique into the fabrication of AAO-based one-dimensional photonic crystal is still challenging. Herein, we report for the first time on the fabrication of AAO optical microcavities by a rationally designed anodization approach. In our study, two feasible methods are used to fabricate microcavities with tunable resonance peak across the visible and near-infrared spectra. Distributed Bragg reflector (DBR) nanostructures are first fabricated by pulse anodization approach, in which the anodization voltage was periodically manipulated to achieve pseudosinusoidal modulation of the effective refractive index gradient along the depth of the AAO nanostructures. Microcavities were created by creating a nanoporous layer of constant porosity between two AAO-DBR nanostructures, and by introducing a shift of the phase of the porosity gradient along the depth of AAO. The position of the resonance peak in these microcavities can be linearly tuned by means of the duration of the high voltage anodization. These optical nanostructures are sensitive to alterations of the effective media inside the nanopores. The AAO microcavity shows a central wavelength shift Of 2.58 +/- 0.37 nm when exposed to water vapor. Our research highlights the feasibility of anodization technique to fabricate AAO-based photonic nanostructures for advanced sensing applications.
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