Abstract
Here, we present a systematic study about the effect of the pore length and its diameter on the specular reflection in nanoporous anodic alumina. As we demonstrate, the specular reflection can be controlled at will by structural tuning (i.e., by designing the pore geometry). This makes it possible to produce a wide range of Fabry-Pérot interferometers based on nanoporous anodic alumina, which are envisaged for developing smart and accurate optical sensors in such research fields as biotechnology and medicine. Additionally, to systematize the responsiveness to external changes in optical sensors based on nanoporous anodic alumina, we put forward a barcode system based on the oscillations in the specular reflection.
Highlights
Specular reflection (Rspecular) is the optical property defined as the mirror-like reflection of light/photons from a surface, in which light/photons from a given incoming direction are reflected into a single outgoing direction
In this study, we have presented an exhaustive analysis about the structural tuning of the Rspecular oscillations in nanoporous anodic alumina
We have demonstrated that (a) The accurate control over the pore geometry in nanoporous anodic alumina (NAA) makes it possible to switch the effective medium of the Fabry-Pérot cavity at will
Summary
Specular reflection (Rspecular) is the optical property defined as the mirror-like reflection of light/photons from a surface, in which light/photons from a given incoming direction are reflected into a single outgoing direction. We put forward an innovative barcode system based on the specular reflection of NAA In this system, an exclusive barcode is related to each set of pore length-pore diameter by means of its Rspecular spectrum. An exclusive barcode is related to each set of pore length-pore diameter by means of its Rspecular spectrum In this way, a wide range of unique barcodes can be generated in the UV-visible region. The pore walls in NAA can be functionalized with many materials (e.g., metals, oxides, polymers, etc.) in an accurate manner by such techniques as atomic layer deposition, dip coating, and layerby-layer deposition This spreads the use of NAA towards more excellent applications as selective separators, optical biosensors, and so forth. The standard image processing package (ImageJ, public domain program developed at the RSB of the NIH, USA) was used to carry out the ESEM image analysis [14]
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