Realisation and optical engineering of linear variable bandpass filters in nanoporous anodic alumina photonic crystals

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dc.contributor.authorSukarno,
dc.contributor.authorLaw, C.
dc.contributor.authorSantos, A.
dc.date.issued2017
dc.descriptionAccepted 3rd May 2017
dc.description.abstractWe present the first realisation of linear variable bandpass filters in nanoporous anodic alumina (NAA-LVBPFs) photonic crystal structures. NAA gradient-index filters (NAA-GIFs) are produced by sinusoidal pulse anodisation and used as photonic crystal platforms to produce NAA-LVBPFs. The anodisation period of NAA-GIFs is modified from 650 to 850 s to systematically tune the characteristic photonic stopband of these photonic crystals across the UV-visible-NIR spectrum. Then, the nanoporous structure of NAA-GIFs is gradually widened along the surface under controlled conditions by wet chemical etching using a dip coating approach aiming to create NAA-LVBPFs with finely engineered optical properties. We demonstrate that the characteristic photonic stopband and the iridiscent interferometric colour displayed by these photonic crystals can be tuned with precision across the surface of NAA-LVBPFs by adjusting the fabrication and etching conditions. Here, we envisage for the first time the combination of anodisation period and etching conditions as a cost-competitive, facile, and versatile nanofabrication approach that enables the generation of a broad range of unique LVBPFs covering the spectral regions. These photonic crystal structures open new opportunities for multiple applications, including adaptive optics, hyperspectral imaging, fluorescence diagnostics, spectroscopy, and sensing.
dc.description.statementofresponsibilitySukarno, Cheryl Suwen Law and Abel Santos
dc.identifier.citationNanoscale, 2017; 9(22):7541-7550
dc.identifier.doi10.1039/C7NR02115A
dc.identifier.issn2040-3364
dc.identifier.issn2040-3372
dc.identifier.orcidLaw, C. [0000-0002-3276-8052]
dc.identifier.orcidSantos, A. [0000-0002-5081-5684]
dc.identifier.urihttp://hdl.handle.net/2440/105870
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.relation.granthttp://purl.org/au-research/grants/arc/DE140100549
dc.relation.granthttp://purl.org/au-research/grants/arc/CE140100003
dc.rightsThis journal is © The Royal Society of Chemistry 2017
dc.source.urihttps://doi.org/10.1039/c7nr02115a
dc.titleRealisation and optical engineering of linear variable bandpass filters in nanoporous anodic alumina photonic crystals
dc.typeJournal article
pubs.publication-statusPublished

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